US Patent: 3,067,337 
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| Servo Amplifier Using Push-Pull Complementary Cascafed Transistors with Means to Superimpose a Higher A. C. Frequency on Information Signal
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	        Patentee:
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 | Charles J. Bowman (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: | 
Jun. 03, 1957 | 
 
| Granted: | 
Dec. 04, 1962 | 
 
 
 
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                        Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co. 
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