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US Patent: 158,807
Improvement in Screw-Drivers
Patentee: William F. Patterson (exact or similar names) - Boston, MA USPTO Classifications: 7/165, 81/438 Tool Categories: screwdrivers : screwdriver blades Assignees: None Manufacturer: Not known to have been produced Witnesses: C. A. Shaw H. E. Metcalf	Patent Dates: Applied: Nov. 02, 1874 Granted: Jan. 19, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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