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US Patent: 3,369,330
Automatic abrading machine
Patentees: Donald K. Greenberg (exact or similar names) - Rockford, IL Mark R. Estabrook (exact or similar names) - Rockford, IL USPTO Classifications: 451/476 Tool Categories: Assignees: Barnes Drill Co. - Rockford, IL Manufacturer: Barnes Drill Co. - Rockford, IL Witnesses: Unknown	Patent Dates: Applied: Aug. 24, 1965 Granted: Feb. 20, 1968 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Barnes Drill Co.

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