Title:
Screw holding screw driver with expanding bit
United States Patent 2506922
US Patent References:
/0595859.html
- - 0595859

Insulated tool
- - 1343101

Screw driver
- - 1563064

Screw driver
- - 1688181

Screw driver
- - 2227466


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