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US Patent: 872,048
Hand-Operated Tool
Single Crank Screwdriver
Patentee:
William Broad - Beaver Falls, PA

USPTO Classifications:
81/177.1, 81/177.4

Tool Categories:
screwdrivers : screwdriver mechanisms

Assignees:
William Broad - Beaver Falls, PA
Erastus E. Pierce - New Brighton, PA
Charles A. White - New Brighton, PA

Manufacturer:
Adbro Mfg. Co. - Pittsburgh, PA

Witnesses:
E. E. Pierce
Charles W. Bradshaw

Patent Dates:
Applied: Feb. 23, 1907
Granted: Nov. 26, 1907

Patent Pictures: [ 1 | 2 ]
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Description:
The tools covered by this patent are intended to allow one handed operation by electricians, mechanics, carpenters, etc.

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