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US Patent: 2,231,233
Process of finishing materials
Patentee: Henry Vienhaus (exact or similar names) - Springfield, OH USPTO Classifications: 106/169.15, 106/169.19, 427/292, 427/388.1, 427/407.1, 427/429 Tool Categories: metalworking machines Assignees: None Manufacturer: Thompson Grinder Co. - Springfield, OH Witnesses: Unknown	Patent Dates: Applied: Jul. 14, 1939 Granted: Feb. 11, 1941 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Thompson Grinder Co.
Description: This patent number was listed on a Thompson Grinder Co. machine plaque.

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