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US Patent: 2,978,843
Apparatus for Grinding Double-Enveloping Worm Elements
Patentees: Fred E. Birtch (exact or similar names) - Bloomfield Township, Oakland County, MI Bernard H. Johnson (exact or similar names) - Traverse City, Grand Traverse Count, MI USPTO Classifications: 125/11.15, 451/123 Tool Categories: metalworking machines : grinders : gear grinding machines Assignees: Michigan Tool Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 29, 1956 Granted: Apr. 11, 1961 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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