XIV

The Diamond Calk Horseshoe Company of Duluth, Minnesota, USA was founded in 1908 by, "blacksmith Otto Swanstrom."

Initially manufacturing horseshoes with a special type of calk——to improve the: animals' foothold on slippery surfaces, the——company successfully adapted to the "development of motorised transport for the masses." And produced a range of adjustable wrenches and pliers from the 1920s. The family-owned company was sold to the Triangle Corporation in 1981; Triangle itself was eventually sold to Cooper Tools.

In 1994, "the last workers vacated." The building was demolished in 1996.

Gallery※

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  Early 8" adjustable wrench manufactured by the Diamond Calk Horseshoe Company
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  Early 8" adjustable wrench manufactured by the Diamond Calk Horseshoe Company: opposite side showing manufacturers marks
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  Diamond Calk Horseshoe CO. 8in adjustable wrench

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