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US Patent: 1,632,600
Internal Grinding Machine
Patentee: Frank O. Hoagland (exact or similar names) - Bridgeport, Fairfield County, CT USPTO Classifications: 451/143, 451/401 Tool Categories: metalworking machines : grinders : internal grinders Assignees: Pratt & Whitney Co. - New York, NY Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 28, 1923 Granted: Jun. 14, 1927 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Pratt, Whitney & Co.
Description: Application renewed 12 May 1926.

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