US Patent: 2,558,275 
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| Lathe Control Mechanism
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	        Patentees:
		   |  
 | Harold J. Siekmann (exact or similar names) - Cincinnati, OH |  
| Harry C. Kemper (exact or similar names) - Goshen Township, Clermont County, 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: | 
Jun. 21, 1949 | 
 
| Granted: | 
Jun. 26, 1951 | 
 
 
 
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                        Joel Havens "Vintage Machinery" entry for R. K. Leblond Machine Tool Co. 
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