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US Patent: 1,978,181
Hydraulically driven surface grinding machine
Patentee: Joseph R. Whittles (exact or similar names) - Rockford, IL USPTO Classifications: 451/213, 451/24, 451/395 Tool Categories: metalworking machines : grinders : surface grinders Assignees: Norton Co. - Worcester, MA Manufacturer: Thompson Grinder Co. - Springfield, OH Norton Co. - Worcester, MA Witnesses: Unknown	Patent Dates: Applied: Dec. 30, 1930 Granted: Oct. 23, 1934 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Norton Co. Vintage Machinery entry for Thompson Grinder Co.

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