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Some states (roughly east to west: MA, NH, RI, MI, IL, and CA) had makers of bar clamps. Listed below, in alphabetic order, are links to further information for each firm.
Use the navigation table at the end of the page for more information.
Adjustable Clamp Company sold bar clamps under the Pony brand. I have yet to find the dates.
Ads in the Lowell City Directory clearly show a number of bar clamps. The range of sizes are unknown. The fixed block has chamfering around the four edges, and the maker's mark, just like the end of a jaw of a wooden clamp.
Ads in the Pawtucket City Directory clearly show a number of bar clamps. The range of sizes are unknown.
A 1910 ad has an illustration of a bar clamp; otherwise nothing is known.
This major section discusses:
There are some troublesome cases:
Craftsman can be considered a brand of Sears, but they may also have been makers at one time.
Hargrave was initially one brand of Cincinatti Tool, but later became the company name.
This section presents pictures of the various clamps that were made, sold, or used by known firms, and by some individuals. There are some standard, or default, pictures I try to get:
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