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US Patent: 624,122
Spiral tool-driver
Patentee: Henry M. Stevenson (exact or similar names) - Perry, IA USPTO Classifications: 74/127, 81/58.3 Tool Categories: screwdrivers : screwdriver mechanisms : spiral screwdrivers Assignees: None Manufacturer: Not known to have been produced Witnesses: Lewis Griswold Eli Brotherson	Patent Dates: Applied: Jun. 02, 1898 Granted: May 02, 1899 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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