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US Patent: 2,020,548
Testing Apparatus for Surface Finish
Patentee: Robert E. W. Harrison (exact or similar names) - Cincinnati, OH USPTO Classifications: 340/870.24, 73/105 Tool Categories: metalworking machines : grinding machines Assignees: Cincinnati Grinders, Inc. - Cincinnati, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 21, 1930 Granted: Nov. 12, 1935 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Cincinnati Grinders, Inc.

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