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US Patent: 1,472,827
Cutter Grinding Attachment
Patentee: Alfred W. Erdman (exact or similar names) - Hartford, Hartford County, CT USPTO Classifications: 451/237, 451/374 Tool Categories: metalworking machines : grinders : grinding attachments Assignees: Pratt & Whitney Co. - Hartford, Hartford County, CT Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 01, 1921 Granted: Nov. 06, 1923 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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