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US Patent: 1,424,764
Surface Grinder
Patentee: Carroll Knowles (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 451/18, 451/287, 451/294 Tool Categories: metalworking machines : grinders : surface grinders Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 07, 1921 Granted: Aug. 08, 1922 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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