The Diamond Calk Horseshoe Company of

Duluth, Minnesota , settlement_type = City , nicknames = Twin Ports (with Superior), Zenith City , motto = , image_skyline = , image_caption = Clockwise from top: urban Duluth skyline; 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 An adjustable spanner (UK and most other English-speaking countries) or adjustable wrench (US and Canada) is any of various styles of spanner (wrench) with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt ...

and

pliers Pliers are a hand tool used to hold objects firmly, possibly developed from tongs used to handle hot metal in Bronze Age Europe. They are also useful for bending and physically compressing a wide range of materials. Generally, pliers consist ...

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

Image:DiamondCalkHorseshoeCo8inchAdjSpanner-1.jpg, Early 8" adjustable wrench manufactured by the Diamond Calk Horseshoe Company Image:DiamondCalkHorseshoeCo8inchAdjSpanner-2.jpg, Early 8" adjustable wrench manufactured by the Diamond Calk Horseshoe Company: opposite side showing manufacturers marks File:Diamond Calk Horseshoe CO. 8in adjustable wrench.png, Diamond Calk Horseshoe CO. 8in adjustable wrench

References

{{Authority control 1908 establishments in Minnesota Demolished buildings and structures in Minnesota Buildings and structures demolished in 1996 Defunct manufacturing companies based in Minnesota