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US Patent: 979,132
Spiral tool-driver
Patentee:
Frank E. Davis (exact or similar names) - Indianapolis, IN

USPTO Classifications:
74/127

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Arthur M. Hood
Thomas W. McMeans

Patent Dates:
Applied: Jan. 24, 1910
Granted: Dec. 20, 1910

Patent Pictures:
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