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US Patent: 2,798,340
Apparatus for grinding internal surfaces
Patentee: William D. Roberts (exact or similar names) - Pittsburgh, PA USPTO Classifications: 451/304, 451/307, 451/310 Tool Categories: metalworking machines : metal sanding machines Assignees: Ryman Engineering Co. - Ellwood City, PA Manufacturer: Ryman Engineering Co. - Ellwood City, PA Witnesses: Unknown	Patent Dates: Applied: Sep. 22, 1955 Granted: Jul. 09, 1957 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Ryman Engineeering Co.

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