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Title:
Cylindrical structure
United States Patent 1842547
Inventors:
Hammel, Victor F.
Application Number:
US49093330A
Publication Date:
01/26/1932
Filing Date:
10/24/1930
Assignee:
Hammel, Victor F.
Primary Class:
Other Classes:
29/897.33, 140/112
International Classes:
B21F45/00; E04H12/10
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