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US Patent: 168,349
Improvement in screw-cutting dies
Patentee: Jireh Case Sherman (exact or similar names) - New Bedford, MA USPTO Classifications: 408/215, 408/231, 76/117 Tool Categories: industrial tools : taps and dies metalworking tools : taps and dies Assignees: None Manufacturer: Pratt, Whitney & Co. - Hartford, CT Witnesses: H. J. Fuller J. H. Galligan	Patent Dates: Applied: Aug. 04, 1875 Granted: Oct. 05, 1875 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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