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US Patent: 101,207
Improvement in Screw and Screw-Driver
Patentee:
Allen S. Apgar - New York, NY

USPTO Classifications:
411/403, 411/919, 81/436

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
Allen S. Apgar - New York, NY
Isaac Arnold, Jr. - Haddam, MA

Manufacturer:
Not known to have been produced

Witnesses:
S. R. Narine
O. D. Roberts

Patent Dates:
Granted: Mar. 29, 1870

Patent Pictures:
USPTO pdf tiff
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