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United States Patent
3,081,655
Issue Date:
March 19, 1963
Current U.S. Class:
83/112
; 83/125; 83/155; 83/206; 83/228; 83/261; 83/277
Current International Class:
B21D 43/04 (20060101); B21D 43/09 (20060101); B21D 43/11 (20060101)
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