Screw holding screw driver with expanding bit
United States Patent 2506922
US Patent References:
Screw driver
2227466

Screw driver
1688181

Screw driver
1563064

Insulated tool
1343101

N/A
0595859


Inventors:
Hansen, Robert S.
Publication Date:
05/09/1950
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Assignee:
Hansen, Robert S.
Primary Class:
81/444
Other Classes:
81/448, 30/164.900, 7/165
International Classes:
B25B23/10; B25B23/02