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US Patent: 447,277
Push screw-driver
Patentee:
Ellsworth Brown (exact or similar names) - Dayton, OH

USPTO Classifications:
74/127

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
James Hays - Dayton, OH

Manufacturer:
Not known to have been produced

Witnesses:
E. Thompson
R. M. Nevin
Patent Dates:
Applied: May 16, 1890
Granted: Feb. 24, 1891

Patent Pictures:
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