Title:
Screw holding screw driver with expanding bit
United States Patent 2506922
Inventors:
Hansen, Robert S.
Publication Date:
05/09/1950
Export Citation:
Click for automatic bibliography generation
Assignee:
Hansen, Robert S.
Primary Class:
81/444
Other Classes:
7/165, 30/164.9, 81/448
International Classes:
B25B23/10; B25B23/02
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US Patent References:
2227466Screw driver
1688181Screw driver
1563064Screw driver
1343101Insulated tool
0595859N/A