Title:
Art of drawing sheet metal
Document Type and Number:
United States Patent 1649841
Inventors:
Otto, May
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Publication Date:
11/22/1927
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Referenced by:
Export Citation:
Assignee:
Otto, May
Primary Class:
Other Classes:
188/374, 72/353.200, 220/DIG.022
International Classes:
B21D22/24; B21D22/20