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US Patent: 91,634
Improvement in screw-driver
Patentee:
William Hofer - New Haven, CT

USPTO Classifications:
74/127

Tool Categories:
screwdrivers : screwdriver mechanisms : spiral screwdrivers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
C. E. Hofer
John C. Hofer

Patent Dates:
Granted: Jun. 22, 1869

Patent Pictures:
USPTO pdf tiff
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