Interchangeable punch and die and retainer for same
United States Patent 2364401

Inventors:
Stellin, Domnic V.
Publication Date:
12/05/1944
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Assignee:
Stellin, Domnic V.
Primary Class:
83/690
Other Classes:
411/539, 83/686, 83/698.910, 279/76
International Classes:
B21D28/34