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US Patent: 2,221,918
Valve Grinding Machine
Patentees: Kenneth R. Bohn (exact or similar names) - Toledo, Lucas County, OH Ernest A. Hall (exact or similar names) - Toledo, Lucas County, OH USPTO Classifications: 209/218, 209/219, 209/221, 209/39 Tool Categories: specialty tools : valve grinding tools specialty machines : valve reseating machines trade specific : vehicle repairer : vehicle mechanic : valve and seat maintenance Assignees: Hall Manufacturing Co. - Toledo, Lucas County, OH Manufacturer: Hall Manufacturing Co. - Toledo, Lucas County, OH Witnesses: Unknown	Patent Dates: Applied: Oct. 21, 1938 Granted: Nov. 19, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Hall Manufacturing Co.

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