Interchangeable bladed screw driver
United States Patent 1935748

Inventors:
Roff, Joseph K.
Publication Date:
11/21/1933
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Assignee:
William, Roff L.
Adolf, Paul
Primary Class:
81/438
Other Classes:
279/102
International Classes:
B25B15/02; B25B23/00; B25B15/00