US Patent: 2,859,665
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| Apparatus for Relieving Portions of the Thread Flanks of Double Enveloping Worm Elements
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Patentees:
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| 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 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 21, 1956 |
| Granted: |
Nov. 11, 1958 |
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Joel Havens
"Vintage Machinery" entry for Michigan Tool Co.
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