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US Patent: 3,037,329
Method and Apparatus for Grinding Drills
Patentees: Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH Eugene L. Ritter (exact or similar names) - Cincinnati, Hamilton County, OH William A. Haggerty (exact or similar names) - Cincinnati, Hamilton County, OH USPTO Classifications: 451/135, 451/375, 451/48 Tool Categories: metalworking machines : grinders : sharpening machines : drill sharpening machines Assignees: Cincinnati Milling Machine Co. - Cincinnati, Hamilton County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Sep. 20, 1957 Granted: Jun. 05, 1962 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.

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