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US Patent: 1,415,251
Screw driver
Patentee: Warren L. McLean (exact or similar names) - San Francisco, CA USPTO Classifications: 74/127 Tool Categories: screwdrivers : screwdriver mechanisms : spiral screwdrivers Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 24, 1920 Granted: May 09, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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