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US Patent: 2,188,158
Screw driver
Patentee:
George L. Rock - North Adams, MI

USPTO Classifications:
279/82, 74/127, 74/57

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Mar. 03, 1937
Granted: Jan. 23, 1940

Patent Pictures:
USPTO pdf tiff
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