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United States Patent
1,333,257
Issue Date:
March 9, 1920
Current U.S. Class:
446/58
Current International Class:
A01C 5/00 (20060101); A01C 5/06 (20060101); A63H 27/00 (20060101); A63H 29/00 (20060101); A63H 29/18 (20060101)
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