Diamond Calk Horseshoe Company

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File:DiamondCalkHorseshoeCo8inchAdjSpanner-1.jpg
Early 8" adjustable wrench manufactured by the Diamond Calk Horseshoe Company
Early 8" adjustable wrench manufactured by the Diamond Calk Horseshoe Company: opposite side showing manufacturers marks

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][2]

References

  1. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ http://home.comcast.net/~alloy-artifacts/diamond-calk-horseshoe.html
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