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United States Patent

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United States Patent 3,512,441
Issue Date: May 19, 1970

Current U.S. Class: 83/571 ; 83/588; 83/618; 83/695; 83/699.41
Current International Class: B23D 15/12 (20060101); B23D 15/00 (20060101); B21C 37/22 (20060101); B21C 37/15 (20060101)


For U.S. patent law, rules, and procedures see MPEP.

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