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US Patent: 442,230
Chuck for Screw Machines
Patentee: Charles Leon Libby (exact or similar names) - Bridgeport, Fairfield County, CT USPTO Classifications: 279/146, 279/46.4, 279/51, 279/54, 384/271 Tool Categories: metalworking machines : screw machines Assignees: Edward P. Bullard - Bridgeport, Fairfield County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Aug. 16, 1890 Granted: Dec. 09, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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