US Patent: 2,521,312 
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| Indicating and Adjusting Mechanism for Machine Tools
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	        Patentees:
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 | Harold J. Siekmann (exact or similar names) - Cincinnati, OH |  
| Ross M. Bacon (exact or similar names) - Cincinnati, OH |  
 
 
 
 
 
| Manufacturer: |  
| Not known to have been produced |  
 
 
 
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        Patent Dates:
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| Applied: | 
Jan. 18, 1945 | 
 
| Granted: | 
Sep. 05, 1950 | 
 
 
 
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                        Joel Havens "Vintage Machinery" entry for R. K. Leblond Machine Tool Co. 
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        Description: |  
| Orginal application 18 Jan, 1945, now patent #2,464,619. Divided and this application 08 Dec 1948. |  
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