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US Patent: 2,216,308
Method and Means for Balancing Grinding Wheels
Patentee: Edwin C. Ballman (exact or similar names) - St. Louis, MO USPTO Classifications: 301/5.21, 451/343, 73/481, 74/568R, 74/570.1 Tool Categories: metalworking machines : grinders : jig grinders : wheel truing devices Assignees: None Manufacturer: Thompson Grinder Co. - Springfield, Clark County, OH Witnesses: Unknown	Patent Dates: Applied: Oct. 10, 1938 Granted: Oct. 01, 1940 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Thompson Grinder Co.
Description: This patent was listed on a Thompson Grinder Co. patent plate.

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