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US Patent: 391,880
Screw-driver
Patentee: Michael Cashin (exact or similar names) - New York, NY USPTO Classifications: 192/43.1, 74/127 Tool Categories: screwdrivers : screwdriver mechanisms : spiral screwdrivers Assignees: None Manufacturer: Not known to have been produced Witnesses: Edward Whelan Joseph Cashin	Patent Dates: Applied: Mar. 31, 1888 Granted: Oct. 30, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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