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US Patent: 1,821,841
Spiral screw driver
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: Oct. 16, 1930 Granted: Sep. 01, 1931 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin "Vintage Machinery" entry for North Brothers Manufacturing Co.

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