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US Patent: 173,780
Improvement in screw-cutting dies
Patentee: John J. Grant (exact or similar names) - Hartford, CT USPTO Classifications: 408/153 Tool Categories: industrial tools : taps and dies metalworking tools : taps and dies Assignees: Pratt & Whitney Co. - Hartford, CT Manufacturer: Pratt, Whitney & Co. - Hartford, CT Witnesses: Theodore G. Ellis Wendell R. Curtis	Patent Dates: Applied: Dec. 02, 1875 Granted: Feb. 22, 1876 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt & Whitney Co.

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