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US Patent: 2,438,239
Ball Grinding Machine
Patentee: Harry A. Toulmin, Jr. (exact or similar names) - Dayton, Montgomery County, OH USPTO Classifications: 451/189, 451/2, 451/50 Tool Categories: metalworking machines : grinding machines Assignees: Thompson Grinder Co. - Springfield, Clark County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 23, 1946 Granted: Mar. 23, 1948 Antedated: Jul. 23, 1946 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Thompson Grinder Co.

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