Just prior to founding Diamond Calk, Otto Swanstrom was the Superintendent of the Giant Grip Horse Shoe Company. It appears the company and Mr. Swanstrom had a falling out at some point as the 3/6/1908 edition of The Little Falls Herald reports Mr. Swanstrom winning a lawsuit against the company.
Diamond Calk Horseshoe Co. (Duluth, MN)
Sub Brands / Trade Names / Trademarks
- Horseshoe & Diamond Logo (Horse Shoes, Horse Shoe Calks) (First Use 8/1908)
- Later Horshoe & Diamond
- Diamalloy (with double line triangle) - (Wrenches, Pliers) (First Use "Latter part of 1931)
- Diamalloy (letters in arch) - (Tin Snips, pullers)
- Diamond (with double triangle) - (Wrenches, Pliers) (First Use "Latter part of 1920)
- Diamond (with triangle) - (Wrenches) (First Use 1919)
Contract Production for:
- Plomb Tool (Adjustables)
- Sears - Craftsman (Adjustables)
- Sears - Fulton (Adjustables)
- Sears - Merit (Adjustables)
- Snap-On (Adjustables)
- S-K (Adjustables)
- MAC (Adjustables)
- MATCO (Adjustables)
- Kelley-How-Thomson (K.H.T.) Company (Adjustables)
- Montgomery Wards - Master Quality (Adjustables)
- Blue-Point (Pliers)