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US Patent: 198,935
Improvement in screw drivers
Patentee:
William L. Gilchrist - Franklin, NH

USPTO Classifications:
81/451

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Unknown

Witnesses:
R. H. Eddy
John R. Snow

Patent Dates:
Applied: Nov. 20, 1877
Granted: Jan. 08, 1878

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

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