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US Patent: 139,069
Improvement in Screw Drivers
Patentee:
Charles Law - Pittston, PA

USPTO Classifications:
81/450

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Unknown

Witnesses:
C. S. Stark
F. C. Mosier

Patent Dates:
Applied: Apr. 30, 1873
Granted: May 20, 1873

Patent Pictures: [ 1 | 2 ]
USPTO pdf tiff
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Description:
One of these appeared in a Martin J. Donnelley auction

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