Английская Википедия:Diamond Calk Horseshoe Company
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.[1]
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
References
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