US Patent: 2,591,452 
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| Internal Dimension Gauge
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	        Patentee:
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 | Max Maag (exact or similar names) - Zurich,  Switzerland |  
 
 
 
 
 
| Manufacturer: |  
| Not known to have been produced |  
 
 
 
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        Patent Dates:
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| Applied: | 
Nov. 21, 1945 | 
 
| Granted: | 
Apr. 01, 1952 | 
 
 
 
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                        Joel Havens 
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| 
        Description: |  
| Joseph K. Schofield - patent attorney 
Application in Switzerland, 13 Nov 1944. |  
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