Chisels, box wrenches and a company newsletter.

Proto started under another name. English Wikipedia and the collector history site Alloy Artifacts both say the business began in 1907 as a small blacksmith shop in Los Angeles, run by Alphonse Plomb, Jacob Weninger and Charles Williams, and that it traded as the Plomb Tool Company. Its early tools, according to Alloy Artifacts, were hand-forged chisels and punches, made mainly for the plumbing and building trades.

The partnership soon changed. Alloy Artifacts says Alphonse Plomb had left by 1917 to go into business for himself, and that in the same year Charles Williams brought in John L. Pendleton, who had worked as a manufacturer’s agent for hardware and tool companies, as a partner and manager. By 1920, the site says, the firm was trading as the Plomb Tool Manufacturing Company and had bought a factory in Los Angeles, a purchase reported in the Los Angeles Times on 25 April 1920. In 1924, according to the same source, John Pendleton’s son Morris B. Pendleton succeeded him as partner and manager.

During the 1920s Plomb moved into tools for car mechanics. Alloy Artifacts says the company’s first catalogues appeared in the mid-1920s, that it offered a series of single-ended 12-point box wrenches by 1926, and that its 1926 catalogue No. 6 listed flex-head drive handles, which Plomb called “hinge” handles. The company advertised in Popular Science Monthly in the late 1920s; a December 1928 advertisement, the site notes, already showed the Plomb name with an inverted triangle, years before that “PLVMB” logo was used on the tools themselves.

The product most associated with the name came next. According to Alloy Artifacts, Plomb announced its new combination wrench, with an open end and a box end of the same size, in the 25 April 1933 issue of its company newsletter, then called Sparks from the Anvil, and offered it in four sizes at launch. Plomb used the word “Combination” for the design from the start, the site says. English Wikipedia also dates the release of the Plomb combination wrench to 1933, and the brand’s own website today describes the combination wrench as “our birthright”.

A trademark dispute, a new name and three owners.

Plomb grew by acquisition in the 1940s. English Wikipedia lists the purchase of Cragin Tool of Chicago in 1940, P&C Tool of Oregon in 1941 and the J.P. Danielson company of Jamestown, New York, in 1947. Alloy Artifacts describes J.P. Danielson as a maker of pliers and adjustable wrenches.

The brand name changed because of a lawsuit. In 1946, according to English Wikipedia and Alloy Artifacts, Plomb was sued for trademark infringement by Fayette R. Plumb, Inc., a maker of hammers and other striking tools. Alloy Artifacts, citing a Time magazine article of 6 December 1948, says the dispute went back to an objection Plumb had raised in 1926.

The result was a new word. English Wikipedia says the company began marking its tools Proto, a blend of “professional” and “tools”, in 1948. Alloy Artifacts adds that the company made sure to register the new trademark, that the Plomb name had disappeared from the tools by 1950, and that the same models continued in production, now marked “Proto Los Angeles”.

The corporate name followed later. Both sources say that in 1957 the company began operating as Pendleton Tool Industries, and Alloy Artifacts says it became publicly traded and acquired Vlchek Tool of Cleveland in 1959. In 1964, according to both, Pendleton Tool Industries was acquired by Ingersoll-Rand, and Alloy Artifacts says the business then operated as the Proto Tools Division of the industrial group.

The current ownership line began in 1984. English Wikipedia says Proto was acquired that year by Stanley and became Stanley Proto Industrial Tools; Alloy Artifacts cites an entry in the 1984 Wall Street Journal index recording The Stanley Works’ agreement to buy the Proto industrial tools unit from Ingersoll-Rand. The Stanley Works later became Stanley Black & Decker, which English Wikipedia describes as Proto’s present parent, and the Proto website’s footer carries a 2026 Stanley Black & Decker copyright line.

Design and documentation.

The brands in this group are all names stamped on mechanics’ and hardware-store tools: wrenches, ratchets, sockets, screwdrivers and the chests that hold them. Tool brands in general sit at many different points in the trade, from companies that sell from a van parked outside a garage to names that belong to a retailer and appear only on its own shelves, and a single name can be sold to professionals and home workshops at the same time.

A tool brand’s identity is usually carried less by one product than by a name forged or stamped into steel, a colour on a toolbox, a logo on a truck and the look of a catalogue. The company behind that name may have been sold, merged or renamed, and the place where the tools are made may have moved more than once. That makes the questions behind each name worth asking plainly: who started it, who owns it now, and where its tools are actually made.

Each guide separates what independent sources record from what the company says about itself — its founding story, its owners over time, where its tools are made and how its marks have changed — and marks plainly what rests only on the company’s own word.

A name built from two words.

Proto’s identity is unusual because its name was not chosen at the start. For four decades the tools carried the founder’s surname, Plomb, and Alloy Artifacts shows that the company had already developed a graphic mark for it: an inverted triangle that turned the word into “PLVMB” on later tools. The 1946 lawsuit from Fayette R. Plumb made that name unworkable, and the company replaced it with a constructed word.

That word was built from a description. “PROfessional TOols”, as Alloy Artifacts renders it, gave the company a short, five-letter mark that said who the tools were for rather than who had made them. English Wikipedia records the same derivation. The change came in 1948, and according to Alloy Artifacts the transition on the tools themselves was complete by 1950.

For some years the new name was paired with a place. Alloy Artifacts says tools of the early 1950s were marked “Proto Los Angeles”, tying the invented word to the city where the blacksmith shop had begun. The same site describes the post-war tools of what collectors call the “Pebble Period”, which carried forged-in markings on a textured background.

The name then outlived three corporate parents. It was kept by Pendleton Tool Industries, by Ingersoll-Rand from 1964, and by Stanley from 1984, when English Wikipedia says the business became Stanley Proto Industrial Tools. Today the Proto website presents the brand to industries such as aerospace, mining, power generation and manufacturing, and the company says its combination wrench helped build the Golden Gate Bridge and Apollo 11.

For a design guide, Proto shows how a forced rename can produce a stronger mark: a descriptive coinage, short enough to stamp into steel, that survived every later change of owner. Compare DeWalt, another tool brand in the Stanley Black & Decker group, and Craftsman, an American hand-tool name with its own long ownership history. For this guide we use a deep navy, a spark orange and a near-black with a condensed sans-serif, an unofficial interpretation; no product or logo is reproduced.

Keep Proto’s identity on hand — save it to a board in the Made Good inspiration library.