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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