Alloy Artifacts |
P&C is best known as a subsidiary of Plomb Tool (later Proto), but was an interesting and innovative company in its own right. Founded around 1920, the company had developed a very extensive line of automotive service tools by the end of the 1920s.
In addition to establishing its own line of tools, P&C also served as the direct or indirect catalyst in the founding of two other tool businesses: Thorsen Manufacturing of Oakland, California, and General Tool of Portland, Oregon.
The roots of P&C go back to a partnership in a blacksmith shop in McCall, Idaho as early as 1914. The partners were John N. Peterson and Charles F. Carlborg, both Swedish immigrants and both highly skilled as blacksmiths and machinists. Information on the early history of their partnership can be found at The Idaho Years [External Link] at a website on P&C noted in our Resources section.
By 1920 the partners were thinking about moving to Oregon and had started to make inquiries there.
The scan in Fig. 1 shows a notice of an inquiry to the Eugene (Oregon) Chamber of Commerce, published on page 5 of the February 27, 1920 edition of the Eugene Morning Register. The text notes that Peterson and Carlborg were interested in opening a forging and machine shop.
(The reference to "Lakeport" may be a local section of McCall, which is situated at the southern end of Payette Lake.)
Within a year the partners had moved to Oregon, although not to Eugene. According to one source, a land swap agreement made it advantageous to move to Lebanon, and by 1921 the partners had set up a machine shop there specializing in vehicle springs.
The scan in Fig. 2 shows an advertisement for the "Lebanon Machine Shop and Spring Works", as published on page 5 of the August 17, 1921 edition of the Lebanon Express.
By all accounts the business in Lebanon went very well, and in particular the partners found great success at a 1922 auto show in Portland, which brought in lots of orders for their forged tools.
As a side note, we will use the 1921 move to Lebanon as the effective founding date for P&C, although as previously noted the partners had worked together for some years prior to the move.
By early 1923 the partners had decided to move to Milwaukie, a suburb of Portland, according to an article on page 5 of the January 10, 1923 edition of the Lebanon Express. The article goes on to note that the business had been incorporated as the P&C Hand Forged Tool Company and was growing rapidly. (This same article mentions the land swap that brought them to Lebanon.)
The P&C Hand Forged Tool Company was listed in the 1923 edition of Polk's Portland City Directory, a business directory covering the Portland area.
A 1923 catalog from J.E. Heseltine provides a valuable snapshot of P&C's tools at this time. The company's tools were forged from chrome-vanadium steel and included speeder wrenches, socket wrenches, box-end wrenches (with hexagon openings), and specialty tools. The extensive use of alloy steel documented by this catalog suggests that P&C had probably been using such alloys for some time, and it would be interesting to discover how far back that usage goes.
In 1925 a chance encounter in Portland brought Peterson and Carlborg together with another acqaintance from their Boise days, Edward A. "Ned" Boyd. Perhaps remembering Boyd's skills as a salesman, P&C hired Ned Boyd to set up and manage a new retail operation for the company. The result was P&C Tools Inc., the retail arm for the company. P&C Tools appears to have been a hybrid operation, functioning both as a sales organization for P&C and as a tool distributor for other brands as well.
In the late 1920s P&C's business was growing rapidly, and in 1927 Ned Boyd hired John C. Derville Sr. as the assistant manager for P&C Tools. Ned Boyd and John Derville shared another Boise connection, as the two had met in 1919 or 1920 at a mason's meeting in Boise.
In 1929 Ned Boyd had a falling out with Peterson and Carlborg in a disagreement over some business matters. The two key issues in the conflict were that P&C wanted to terminate the exclusive sales agreement with Boyd's retail operation, and that P&C wouldn't accept a large tool contract for a major California aviation company. Apparently Boyd had negotiated a major deal with the aviation company, but for tools that would have required retooling the entire factory. Peterson and Carlborg didn't want to abandon their current product line and so refused to accept the contract.
After his disagreement with Peterson and Carlborg, Ned Boyd resigned from P&C Tools and left for California, where he proceeded to establish Thorsen Manufacturing in Oakland. In addition, Boyd managed to persuade two key P&C employees to leave with him to set up the new business, and Thorsen was soon in operation as a competing tool company. According to Derville family recollections, the name Thorsen was "picked out of thin air", basically because Thorsen was a Swedish name and Swedish steel had a reputation for high quality. (Interested readers can find more information in our article on Thorsen Manufacturing.)
The events leading to the founding of Thorsen are corroborated by a newspaper article appearing in the August 1, 1929 edition of the Milwaukie Review. With the heading "Tool Plant to Have New Building Soon" and a byline "Unfounded Rumors Abroad", the article first denies a rumor that P&C was planning to move to Los Angeles or elsewhere, and states that, on the contrary, the company is considering expanding their current operations. Citing John Peterson, the article further notes a rumor that P&C management had sold out and that the company name would change. Peterson indirectly attributes the rumors to a recently organized company in Oakland "with a very similar name", and accuses ex-employees (of P&C) of taking advantage of the reputation of P&C.
When he left for California, Ned Boyd sold his stake in P&C Tools to his associate John Derville, and the P&C management then insisted that the retail organization operate as an independent entity. P&C Tools was accordingly renamed to the General Tool Company and continued in operation as a full-line tool distributor, carrying P&C as well as many other brands. General Tool continues today (2009) in its 80th year of operations as a family-run business.
P&C was an important pioneer in the development of 12-point box-end wrenches, a tool made possible by the advent of alloy steel.
By 1926 the company was offering a selection of single-ended 12-point box wrenches, making P&C one of the first companies (along with Plomb) to offer these tools in a selection of sizes. (APCO had offered a 5/8 12-point Offset Box Wrench as a Model T connecting rod wrench in 1922.)
The scan in Fig. 3 shows a catalog listing for flat 12-point box wrenches, as published on page 19 of P&C catalog No. 5 from 1926.
The text notes that the wrenches were hand forged from chrome-vanadium steel, and the table below the illustration lists the 4xx-series wrenches in eight sizes from 7/16 to 15/16.
The catalog also offered the same eight sizes in an RO4xx-series of offset box wrenches and an R4xx-series of wrenches with lateral offsets.
Note the use of the P&C-Hex logo at the top of the page.
By 1928 P&C was offering box-end wrenches in a double-ended style, with one end straight and the other offset.
The scan in Fig. 4 shows a catalog listing for single offset double box-end wrenches, as published on page 21 of the P&C catalog No. 7 from 1928.
The table below the illustration lists the 04xx-series wrenches in seven sizes from 7/16 to 7/8.
Note that the illustration shows the offset end with a quirky and distinctive tapered style, which became one of the defining characteristics of P&C's box wrenches. The 1928 catalog also shows this tapered style in the illustrations for the RO4xx-series offset box wrenches and the 8283B Chevrolet main bearing wrench, and within a few years all of P&C's offset box wrenches would use this style.
By 1928 several competitors had entered the market for box-end wrenches. Blue Point had introduced single-offset "Boxocket" box wrenches in 1927 (possibly produced by MTF), and MTF itself began offering double-offset box wrenches in 1928. In 1928 Truth Tool also began offering box wrenches, and Plomb Tool expanded its selection to include the AD-series double-ended offset box wrenches.
The biggest change for 1928 though was the entry of Bonney Forge and Tool Works as a maker of box wrenches. Bonney produced a No. 2540 Main Bearing Box Wrench for its own label and also provided box wrenches as contract production for APCO-Mossberg, including an APCO-Mossberg 3011 Main Bearing Wrench and an APCO-Mossberg 3014 Specialty Box Wrench. Interestingly, Bonney's early production had tapered box ends very similar to the P&C style, suggesting that Bonney may have copied an example from P&C.
Bonney was the first major tool company to make box-end wrenches, and their early experiments quickly turned into a full line of box wrenches. The late 1920s and early 1930s saw a number of additional makers of box wrenches, and the 1931 introduction of box wrenches into retail markets by Western Auto Supply marked the full acceptance of the box wrench as an essential service tool.
During the 1930s P&C continued to expand its automotive and aviation tool business, although this period may have seemed quiet in comparison with the drama of the late 1920s. One interesting event did occur though, when P&C was sued for patent infringement by Samuel Eagle, the inventor of a design for flex-head (or "hinge") handles used by Plomb. Eagle had received patent #1,380,643 in 1921, and Plomb had offered tools in this design since the late 1920s. (See for example the Plomb DTH Hinge Handle.)
P&C had also offered flex-head handles since the 1920s, but in a slightly different design, with the fork on the flex head rather than on the handle. The flex-head handles became a very popular tool, and by 1930 P&C had started offering flex handles in the Eagle design as well. (P&C referred to their original design as "Outside Head" models, with the Eagle design as the "Inside Head" version.)
In the early 1930s Samuel Eagle filed a patent infringement lawsuit against the P&C Hand Forged Tool Company, but in a 1935 decision (Eagle v. P&C Hand Forged Tool Co., 9 Cir., 74 F.2d 918, 920) the court found in favor of P&C. The court determined that the Eagle patent was invalid based on claims in several different prior patents, and this case has been cited in later patent infringement cases as a precedent.
The effects of this court decision rippled through the tool industry, as a number of companies that had been making outside-head flex handles switched to the inside-head design.
The next major change for P&C came in 1941, when the company was acquired by the Plomb Tool Company of Los Angeles. P&C may have supplied heavy-duty box-end wrenches to Plomb prior to the acquisition, as the Plomb 10xx Series Wrenches closely resemble P&C production. The 10xx series wrenches were offered beginning in 1938.
Plomb Tool had similar roots as a blacksmith operation and hand-forged tool maker, but had been growing rapidly under the leadership of Morris Pendleton. Plomb Tool left the operation of P&C largely independent, but made use of the P&C manufacturing facilities for some of Plomb's supply.
In 1948 Plomb Tool changed its brand name to Proto following a trademark dispute.
In later years P&C continued to prosper as part of the Proto empire, but their tool designs gradually lost their distinctive character and became more like clones of the Proto line.
Plomb Tool changed its name to Pendleton Tool Industries in the late 1950s, and in the mid 1960s Pendleton was acquired by Ingersoll Rand, an industrial conglomerate. IR management apparently saw no reason to continue offering multiple brands of similar tools, and in the late 1960s the P&C division was closed.
Patent No. | Inventor | Filed | Issued | Notes and Examples |
---|---|---|---|---|
1,538,721 | F. Merdian | 05/24/1924 | 05/19/1925 | Specialty Puller |
1,643,814 | J.N. Peterson | 05/11/1926 | 09/27/1927 | Flex-Head Handle |
1,643,855 | J.N. Peterson | 08/21/1925 | 09/27/1927 | Universal Joint Handle |
1,643,901 | J.N. Peterson | 08/08/1925 | 09/27/1927 | Socket Wrench |
1,864,466 | J.N. Peterson | 09/10/1930 | 06/21/1932 | Tool Holder |
2,109,740 | C.F. Carlborg | 07/15/1936 | 03/01/1938 | Gear Puller |
P&C was not very active in the trademark arena, with their only known trademark being the P&C-Hex logo. The trademark was filed in 1951 and registered in 1953, with the first use listed as January of 1926.
P&C tools were generally stamped with the company's logo and are thus easy to identify.
P&C tools can be identified by a distinctive logo consisting of the letters "P&C" in an elongated hex outline.
This is referred to as the P&C-Hex logo in the text here, and this mark was generally stamped on tools beginning around 1926.
The scan in Fig. 5 shows the P&C logo as it was registered in the 1953 trademark #572,863.
Some time after the 1953 trademark registration, P&C began adding the trademark symbol (®) to their tool markings, below and to the lower right of the company logo.
Examples of the P&C-Hex logo can be found on most of the tools in this article.
Photographs and observations of particular tools are based on items in the Alloy Artifacts collection.
Information on the early history of P&C is based on recollections of the Derville family, as passed along by another tool collector. The Derville family are the owners of the General Tool Company of Portland, Oregon, a tool distributor now (2009) in its 80th year of operations.
A website providing historical information on P&C and its founders is available at www.pnctools.com [External Link]. This site offers biographical information on the founders, as well as early photographs and catalogs.
Editions of the Polk's Portland City Directory, a business directory covering the Portland (Oregon) area, are available in the Portland public library.
Back issues of the Milwaukie Review newspaper are available on microfiche in the Milwaukie (Oregon) public library.
Catalog | Date | Notes |
---|---|---|
No. 5 | 1926 | Copyright 1926. 48 pages.
Available for Download [External Link] from ITCL. Lists flex handles with "Outside Head" design. Lists 4xx-series 12-point box-end wrenches in 8 sizes, earliest known listing. |
No. 6 | 1927 | Copyright 1927. 48 pages.
Available for Download [External Link] from ITCL. Lists flex handles with "Outside Head" design. Lists 4xx-series 12-point box-end wrenches in 8 sizes. |
No. 7 | 1928 | Copyright 1928. 56 pages.
Available for Download [External Link] from ITCL. Lists flex handles with "Outside Head" design. Lists RO4xx-series box-end wrenches with tapered box end. Lists 04xx-series single-offset box-end wrenches with tapered box end. Lists 8283B 13/16x7/8 Chevrolet main bearing wrench with tapered box ends. |
No. 8 | 1929 | Copyright 1929. 56 pages.
Available for Download [External Link] from ITCL. Lists flex handles with "Outside Head" design. Lists RO4xx-series box-end wrenches with tapered box end. Lists 04xx-series single-offset box-end wrenches with tapered box end. Lists 8283B 13/16x7/8 Chevrolet main bearing wrench with tapered box ends. |
No. 30 | 1930 | Copyright 1930. 56 pages.
Lists flex handles with both "Inside Head" and "Outside Head" design. Lists double offset box wrenches in B-xxxx 12-point and E-xxxx 6-point styles. Lists double offset box wrenches in long C-xxxx 12-point and F-xxxx 6-point styles. |
No. 32 | 1931 | Copyright 1931. 72 pages + supplement.
Lists flex handles with both "Inside Head" and "Outside Head" design. Lists double offset box wrenches in B-xxxx 12-point and E-xxxx 6-point styles. Lists double offset box wrenches in long C-xxxx 12-point and F-xxxx 6-point styles. |
No. 35 | 1934 | Copyright 1934. 36 pages.
Available for Download [External Link] from ITCL. Socket tools in 3/8, 1/2, and 3/4-drive. Includes flex handles with both "Inside Head" and "Outside Head" design. Lists double offset box wrenches in long 22xx-series, successor to C-xxxx series. Lists single offset box wrenches in long 24xx-series, successor to 04xx series. Lists "Two-in-one" combination wrenches from 2712 (3/8) to 2732 (1 inch). |
No. 5300 | 1953 | Round-shank box wrench 22xx series still listed. |
No. 61200 | 1961 | P&C Tool Company, subsidiary of Pendleton Tool Industries, Inc. |
No. 63200 | 1963 | Copyright 1963 P&C Tool Company. 36 pages.
Notes subsidiary of Pendleton Tool Industries, Inc. Available for Download [External Link] from ITCL. |
No. 65200 | 1965 | No copyright, dated 1/65 on back cover. 68 pages.
Notes subsidiary of Pendleton Tool Industries, Inc. Available for Download [External Link] from ITCL. |
P&C tools were carried by some industrial distributors and automotive dealers, and the catalogs of these companies provide valuable information on the company's products.
Alloy Artifacts is fortunate to have a rare original copy of the 1923 J.E. Haseltine catalog, published by an old-line industrial distributor in Portland, Oregon. This catalog contains what must have been the full line of P&C tools at that time, and it shows a surprisingly broad selection given that P&C was still a small company. (And listing a product with an industrial distributor means that you have to be able to make it in quantity.)
The catalog was published with a 1923 copyright date. With the probable lead time required for a major catalog, it's likely that the illustrations for this publication would have been prepared in 1922, when P&C was still located in Lebanon, Oregon. The catalog thus can be considered as a snapshot of P&C in 1922, and is significant in being the earliest known (and reliably dated) catalog for P&C.
Given the significance of this catalog, we thought it would be appropriate to show some scans of the illustrations before we present photographs of actual tools. Due to the catalog binding, we were not able to get clear edge-to-edge images with our scanner, but we hope that these raw scans will still give the reader a good impression of early P&C production.
J.E. Haseltine & Company was established in 1856 and was located at Second and Ash Streets in Portland. As an industrial distributor, it stocked supplies for blacksmiths, machinists, and especially the "Garage Man", the latter term referring to supplies and tools for the fast-growing automobile industry.
The main section for P&C tools is on pages 120-124, which includes listings for fixed socket wrenches, speeder wrenches, box-end wrenches, and specialty tools. Additional P&C listings include chisels and punches on pages 75-76, a wrecking bar and a fender hammer on page 78, and a Buick valve cage lifter on page 104.
Other automotive service tools included socket sets by Mossberg, Billmont, and Quick Way, pliers by Kraeuter, and a wide range of tools by other companies.
The scan in Fig. 7 shows the beginning of the main section for P&C tools on page 120, with a socket size table, listings for short and long offset socket wrenches, and an illustration of a Model-T engine showing the use of a "One Man" wrench.
An information box at the upper left notes that P&C was using chrome vanadium alloy steel for its socket wrenches, the same alloy that Bonney had just announced (to great fanfare) in 1922.
The short and long offset socket wrenches were offered in 14 sizes ranging from 5/16 to 1-1/16, with model numbers from 1510 to 1534 for short wrenches and 1610 to 1634 for long wrenches. Note the use here of model numbers based on the size in 32nds, a simple and rational convention that the rest of the industry would adopt maybe 10 years later.
The scan in Fig. 8 shows page 121 of the P&C section, with listings for short, long, and extra long speeder socket wrenches, a universal speeder, and specialty wrenches.
Also of interest is the table for sockets at the lower left. Although the illustration seems to show a square drive opening, these sockets were apparently intended only for repairing speeder wrenches. (At this time P&C did not offer any interchangeable socket tools.) This would have been a kind of DIY repair — the customer was expected to square the shaft and then drive the socket on!
Fig. 9 shows an early P&C 1/2-drive Ell handle, stamped with the P&C-Hex logo.
The overall length is 7.2 inches, and the finish is plain steel.
Fig. 10 shows an early 1/2-drive P&C 6008B universal extension, marked with the P&C-Hex logo.
The overall length is 7.0 inches, and the finish is plain steel.
This tool is not marked with a model number, but was identified by the illustration in the 1929 P&C catalog No. 8. The catalog shows a price of $1.90 net to the trade.
Fig. 11 shows a 1/2-drive P&C 6205 10 inch extension, stamped with the P&C-Hex logo and model number.
The overall length is 10.2 inches, and the finish is plain steel.
Fig. 12 shows an early P&C 1/2-drive universal, stamped with the P&C-Hex logo on the base. Although not marked with a model number, this is believed to be an early 6208 universal.
The overall length is 2.3 inches, and the finish is plain steel.
Fig. 13 shows a later 1/2-drive P&C 6208 universal, stamped with the P&C-Hex logo and model number.
The overall length is 2.3 inches, and the finish is plain steel.
Fig. 14 shows a 1/2-drive P&C 6211 ratchet, marked with the model number and P&C-Hex logo.
The overall length is 10.3 inches, and the finish is plain steel.
Fig. 15 shows a P&C 6071 3/4-drive (female) to 1/2-drive (male) adapter, marked with the P&C-Hex logo and model number.
The overall length is 1.9 inches, and the finish is plain steel.
Fig. 16 shows a 3/4-drive P&C 9206 15 inch extension, marked with the P&C-Hex logo and model number (see inset).
The overall length is 15.2 inches.
Fig. 17 shows an early P&C 9/16 hex ratcheting box wrench, stamped with the P&C-Hex logo on the shank.
The overall length is 8.5 inches, and the finish is plain steel.
P&C's box wrenches have a distinctive style that deserves a note here. On P&C box wrenches the box ends are forged with tapering walls resembling a conic section, so that the downward edge is somewhat thinner than the top. In contrast, most other makers produced box wrenches with slightly rounded walls.
Recently we noticed that certain early Bonney specialty wrenches also have tapering box ends, although Bonney's standard box wrenches all have the more common rounded surface. These Bonney specialty box wrenches were in production as early as 1928 (see for example the Bonney 2540 Chevrolet Main Bearing Wrench), probably around the same time that P&C started making its Chevrolet main bearing wrench with 12-point box ends. The No. 8283B Chevrolet main bearing wrench in the 1928 P&C catalog No. 7 closely resembles the Bonney 2540 model.
Tapered box ends were also illustrated in the 1928 P&C catalog No. 7 for the single-ended RO4xx-series offset box wrenches and the 04xx-series single offset box wrenches.
It's possible that the resemblance of the two brands is accidental, but since P&C had been making 12-point box wrenches for two years before Bonney, it's also possible that Bonney's design may have been influenced by the P&C model.
Later Thorsen box wrenches also closely resemble the P&C examples, but here the influence is well understood — Thorsen hired away one of P&C's die makers to help start the company.
Fig. 18 shows a P&C 2220E 5/8x11/16 offset box-end wrench, marked with the P&C-Hex logo stamped on the shank.
The overall length is 9.3 inches, and the finish is nickel plating, with some loss due to wear.
Fig. 19 shows a P&C 2222-E 5/8x11/16 offset box-end wrench with the P&C-Hex logo stamped on the shank.
The overall length is 9.7 inches, and the finish is plain steel.
Fig. 20 shows a P&C 2222 5/8x11/16 offset box-end wrench, marked with the P&C-Hex logo stamped on the shank.
The overall length is 9.2 inches, and the finish is chrome plating.
Fig. 21 shows a P&C 2225 3/4x25/32 offset box-end wrench with the P&C-Hex logo stamped on the shank.
The overall length is 11.0 inches, and the finish is chrome plating with polished ends.
Fig. 22 shows a P&C 2228 3/4x7/8 offset box-end wrench with the P&C-Hex logo stamped on the shank.
The overall length is 12.1 inches, and the finish is plain steel.
Fig. 23 shows a P&C 2232 15/16x1 inch offset box-end wrench with the P&C-Hex logo stamped on the shank.
The overall length is 14.7 inches, and the finish appears to be nickel plating, though darkened by rust.
Fig. 24 shows a P&C 2532 15/16x1 inch offset box-end wrench, stamped with the model number and P&C-Hex logo.
The overall length is 13.8 inches, and the finish appears to be cadmium plating.
Fig. 25 shows a P&C N-84 13/16x7/8 offset box-end wrench, stamped with the P&C-Hex logo.
The overall length is 11.3 inches, and the finish is cadmium plating.
Fig. 26 shows a P&C N-86 1-1/16x1-1/8 offset box-end wrench, stamped with the P&C-Hex logo and fractional sizes.
The overall length is 15.1 inches, and the finish is cadmium plating.
Fig. 27 shows a P&C N-87 1-1/4x1-5/16 offset box-end wrench, stamped with the P&C-Hex logo and fractional sizes.
The overall length is 17.1 inches, and the finish is plain steel with pitting due to rust.
Fig. 28 shows a P&C WF-89 1-7/16x1-1/2 offset box-end wrench, stamped with the P&C-Hex logo and fractional sizes.
The overall length is 19.9 inches, and the finish is cadmium plating.
The construction of this wrench is very similar to the P&C N-8x series of box wrenches, but the unusual WF-89 model number indicates that the wrench was supplied to Plomb Tool as part of their WF-series military contract.
Fig. 29 shows a P&C 2820 9/16x5/8 open-end wrench, stamped with the P&C-Hex logo on the shank.
The overall length is 6.4 inches, and the finish is chrome plating.
Fig. 30 shows a P&C 2718 9/16 combination wrench, stamped with the P&C-Hex logo on the shank.
The overall length is 7.1 inches, and the finish is chrome plating.
After the acquisition by Plomb Tool, P&C continued to operate as a quasi-independent division of Plomb (later renamed to Pendleton Tool Industries) until sometime in the late 1960s. During this period the P&C branded tools gradually lost their distinctive character as the tool lines for the various divisions were "harmonized". In addition, many P&C branded tools were actually made by other factories within the corporate structure, in order to maximize the economies of scale for each company unit.
In this section we'll show a few examples of late P&C branded tools, and more examples can be found in our article on P&C within the Proto Empire.
Fig. 31 shows the P&C model 1234 compound-leverage pliers, marked "Mfd. U.S.A." with the P&C-Hex logo and a patent notice. (A patent number is stamped on the tool, but has been partially worn off so that only the last three digits "512" are readable.)
The overall (extended) length is 8.3 inches, and the finish is chrome plating with polished faces.
The full patent number was found to be patent #2,600,512, issued to H.A. Mead in 1952.
This patent was also used by Proto for its equivalent model. An example of Proto's version can be seen as the Proto 234 Pliers.
Fig. 32 shows a P&C 1708-S 8 inch adjustable wrench, stamped with the P&C-Hex logo and a registered trademark symbol, and with "Forged Alloy Steel" in forged raised letters.
The overall length is 8.1 inches, and the maximum opening is 1.0 inches. The maximum head thickness was measured at 0.50 inches.
This example is finished in black oxide, as indicated by the "S" suffix to the model number. Adjustable wrenches were also available with a chrome plated finish.
A forged-in code "P55" can be seen on the shank at the right.
As part of the Proto Empire, P&C's adjustable wrenches were made by the J.P. Danielson company, another company acquired by Plomb Tool in the 1940s. Other examples of Danielson production can be seen as the Danielson "Bet'R-Grip" 6 Inch Adjustable Wrench, Plomb 706 Adjustable Wrench, and Vlchek AV6 Adjustable Wrench.
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