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US Patent: 219,425
Improvement in Crank Screw-Drivers
Patentee:
George Abrams - Philadelphia, PA

USPTO Classifications:
81/438

Tool Categories:
screwdrivers : screwdriver mechanisms

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Robert A. Brown
William J. McHenry

Patent Dates:
Applied: Jul. 31, 1879
Granted: Sep. 09, 1879

Patent Pictures:
USPTO pdf tiff
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