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US Patent: 2,377,991
Automatic abrading machine
Patentee: Gustave A. Carlson (exact or similar names) - Detroit, MI USPTO Classifications: 279/2.03, 279/2.12, 451/285, 451/385 Tool Categories: metalworking machines : grinders Assignees: None Manufacturer: Acme Mfg. Co. (Michigan) - Detroit, MI Witnesses: Unknown	Patent Dates: Applied: Oct. 13, 1943 Granted: Jun. 12, 1945 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Acme Mfg. Co. (Michigan)
Description: This grinding machine is specialized for the finishing to size of a hemispherical washer to very narrow tolerances.

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