US Patent: 2,289,110
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| Milling Speed Calculator
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Patentees:
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| Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH |
| Raymond D. Wortendyke (exact or similar names) - Cincinnati, Hamilton County, OH |
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Patent Dates:
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| Applied: |
Aug. 11, 1941 |
| Granted: |
Jul. 07, 1942 |
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Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.
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Description: |
| This patent number was seen on a Cincinnati Milling Machine Co. patent plate 4FV-101. |
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