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US Patent: 279,917
Screw-Driver
Patentee:
Frederick J. Colvin (exact or similar names) - Hamden, CT

USPTO Classifications:
279/43.3, 279/97, 81/438

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Henry A. Colvin
Ellsworth B. Cooper

Patent Dates:
Applied: Apr. 05, 1883
Granted: Jun. 26, 1883

Patent Pictures:
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