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US Patent: 1,460,201
Spiral tool
Patentee: George O. Leopold (exact or similar names) - Philadelphia, PA USPTO Classifications: 74/127 Tool Categories: screwdrivers : screwdriver mechanisms : spiral screwdrivers Assignees: North Brothers Manufacturing Co. - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 28, 1922 Granted: Jun. 26, 1923 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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