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US Patent: 2,859,665
Apparatus for Relieving Portions of the Thread Flanks of Double Enveloping Worm Elements
Patentees: Fred E. Birch (exact or similar names) - Bloomfield Township, Oakland County, MI Bernard H. Johnson (exact or similar names) - Traverse City, Grand Traverse Count, MI USPTO Classifications: 409/42, 409/48 Tool Categories: metalworking machines : metal relieving attachments metalworking machines : gear making machines Assignees: Michigan Tool Co. - Detroit, Wayne County, MI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 21, 1956 Granted: Nov. 11, 1958 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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