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United States Patent
1,402,473
Issue Date:
January 3, 1922
Current U.S. Class:
451/374
; 137/377; 251/328; 451/185; 451/186; 451/217; 451/221; 451/239
Current International Class:
B24B 3/22 (20060101); B24B 3/00 (20060101)
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