Title:
Drop hammer
Document Type and Number:
United States Patent 1720592
Inventors:
Fitzgerald, William H. J.
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Publication Date:
07/09/1929
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Export Citation:
Assignee:
PNEUMATIC DROP HAMMER COMPANY
Primary Class:
Other Classes:
72/455, 81/20, 72/482.920
International Classes:
B21J7/36; B21J7/00