US Patent: 2,697,373 
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| Tracer Controlled Facing Lathe
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	        Patentees:
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 | Harold J. Siekmann (exact or similar names) - Cincinnati, OH |  
| George J. Kasselmann (exact or similar names) - Cincinnati, OH |  
| George W. Luning (exact or similar names) - Cincinnati, OH |  
| Nelson D. Cooper (exact or similar names) - Mariemont, Hamilton County, OH |  
 
 
 
 
 
| Manufacturer: |  
| Not known to have been produced |  
 
 
 
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        Patent Dates:
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| Applied: | 
May 08, 1952 | 
 
| Granted: | 
Dec. 21, 1954 | 
 
 
 
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                        Joel Havens "Vintage Machinery" entry for R. K. Leblond Machine Tool Co. 
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