Title:
Extension boom for cranes
United States Patent 1920370


Inventors:
Forsythe, Charles E.
Forsythe, James A.
Application Number:
US57499731A
Publication Date:
08/01/1933
Filing Date:
11/14/1931
Assignee:
Forsythe, Charles E.
Forsythe, James A.
Primary Class:
Other Classes:
37/397
International Classes:
B66C23/66
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