Collapsible draw mandrel
United States Patent 1713962

Inventors:
Julius, Grossweischede
Georg, Reichenbecher
Publication Date:
05/21/1929
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Assignee:
VER STAHLWERKE AG
Primary Class:
72/482.400
Other Classes:
264/323
International Classes:
B21C1/26; B21C3/16; B21C1/16; B21C3/00