Title:
Art of forming tubes
Document Type and Number:
United States Patent 1344105
Inventors:
Vance, Walter N.
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Publication Date:
06/22/1920
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Assignee:
DURAND STEEL LOCKER COMPANY
Primary Class:
Other Classes:
72/404, 72/375, 72/415
International Classes:
B21C37/10; B21C37/06