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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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