| US Patent: 1,938,772 
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| Hydraulic Drive for Milling Machines | 
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| Patentees: |  
 | Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH |  | Herman R. Isler (exact or similar names) - Norwood, Hamilton County, OH |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Mar. 08, 1930 |  
| Granted: | Dec. 12, 1933 |  USPTO (New site tip)
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                        Joel Havens
 "Vintage Machinery" entry for Cincinnati Milling Machine Co.
 
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| Description: |  | This patent number was seen on a Cincinnati Milling Machine Co. patent plate 4FV-101. |  |