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US Patent: 417,722
Screw Driver
Patentee:
Daniel R. Hart (exact or similar names) - New York, NY

USPTO Classifications:
411/402, 411/919, 81/436

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Geo. Wadman
Philip J. O'Reilly
John F. Hart
Patent Dates:
Applied: Dec. 08, 1888
Granted: Dec. 24, 1889

Patent Pictures:
Daniel R. Hart patent December 24, 1889
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Description:
The tip is formed to match a parallel-sided notch in a round-top wood screw.

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