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US Patent: 3,623,275
Composite Abrasive Finishing Tool
Patentee: Charles G. Koella (exact or similar names) - Rochester, Oakland County, MI USPTO Classifications: 451/340, 451/541 Tool Categories: metalworking machines : gear cutting tools Assignees: Michigan Tool Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 10, 1969 Granted: Nov. 30, 1971 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Michigan Tool Co.

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