Apparatus for producing shaped sections of uniform thickness from sheet metal strips
United States Patent 1909930

Inventors:
Ridder, Ernst DE.
Publication Date:
05/23/1933
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Assignee:
MAGNESIUM DEV CORP
Primary Class:
72/166
Other Classes:
52/749.100, 52/745.190, 72/475, 72/381, D25/121, 72/700
International Classes:
B21D5/06