Portable power-operated hammer
United States Patent 1718425

Inventors:
Hilstad, John R.
Publication Date:
06/25/1929
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Assignee:
Harry, Canterbury H.
George, Griffith G.
Primary Class:
72/436
Other Classes:
173/202, 173/170, 72/438
International Classes:
B25D11/10; B25D11/00