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US Patent: 902,957
Locking mechanism for ratchet screw-drivers
Patentee: Zachry T. Furbish (exact or similar names) - Philadelphia, PA USPTO Classifications: 74/127, 74/577R, D8/82 Tool Categories: screwdrivers : screwdriver mechanisms : spiral screwdrivers Assignees: North Brothers Manufacturing Co. - Philadelphia, PA Manufacturer: North Brothers Manufacturing Co. - Philadelphia, PA Witnesses: Unknown	Patent Dates: Applied: Dec. 31, 1902 Granted: Nov. 03, 1908 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward George Langford

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