Title:
Process of making sheet-metal frames
Document Type and Number:
United States Patent 1676222
Inventors:
Sheldon, William O.
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Publication Date:
07/03/1928
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Referenced by:
Export Citation:
Assignee:
YODER CO
Primary Class:
Other Classes:
72/181, 5/200.100
International Classes:
B21D53/74; B21D53/00