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US Patent: 91,634
Improvement in screw-driver
Patentee: William Hofer (exact or similar names) - 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 (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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