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US Patent: 1,611,048
Back Rest for Cylindrical Grinders
Patentee: Carroll Knowles (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 451/242, 451/407 Tool Categories: metalworking machines : grinders : cylindrical grinders Assignees: Pratt & Whitney Co. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 17, 1923 Granted: Dec. 14, 1926 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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