Knockout device for punch presses
United States Patent 2576295
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Inventors:
Good, Alonzo C.
Publication Date:
11/27/1951
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Assignee:
NCR CO
Primary Class:
83/98
Other Classes:
83/112, 72/427, 83/127, 83/125
International Classes:
B21D45/00
US Patent References:
1007103
1208019
1503829Power press for forming mica washers and other insulating forms