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| US Patent 2616285 |
Some corner tools were designed for specifically for drywall, instead of both drywall and plaster. One example that I came across on
US eBay received
US Patent 2616285 on 4 Nov 1952.
The inventor was Samuel Tilden Shields (28 Sep 1894 - 3 Mar. 1964), born in Cleveland to John J. Shields and Harriet Van Gorder. Samuel Shields was a salesman, a contractor in Cleveland in the 1920s, and in sales again by 1942. He also received
US Patent 2787820 in 1957 with Alfred Knudsen. This was for a window buck, a steel jamb for poured concrete walls.
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| Shields drywall corner tool |
