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US Patent: 1,287,731
Automatic Grinding Machine
Patentee: Friederich Müller (exact or similar names) - Hartford, CT USPTO Classifications: 451/221, 451/335, 451/544 Tool Categories: metalworking machines : grinders Assignees: Pratt & Whitney Co. - New York, NY Manufacturer: Not known to have been produced Witnesses: none listed	Patent Dates: Applied: May 02, 1917 Granted: Dec. 17, 1918 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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