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CA Patent: CA-517,417
Grinding apparatus of the traveling belt type
Patentee: William D. Roberts (exact or similar names) - Pittsburgh, PA USPTO Classifications: 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: Granted: Oct. 11, 1955 Patent Pictures: CIPO Data Report data errors or omissions to steward Jeff Joslin "Vintage Machinery" entry for Ryman Engineeering Co.

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