Title:
Art of drawing sheet metal
United States Patent 1649841
Inventors:
Otto, May
Publication Date:
11/22/1927
Export Citation:
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Assignee:
Otto, May
Primary Class:
72/347
Other Classes:
72/353.2, 188/374, 220/DIG.22
International Classes:
B21D22/24; B21D22/20
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