US Patent: 2,728,268
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| Concavity Generating Milling Machine
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Patentees:
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| Richard N. Clifton (exact or similar names) - Cincinnati, Hamilton County, OH |
| Milton V. Waters (exact or similar names) - Cincinnati, Hamilton County, OH |
| Peter F. Ochotschinsky (exact or similar names) - Cincinnati, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 21, 1951 |
| Granted: |
Dec. 27, 1955 |
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Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.
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