| US Patent: 2,305,128 
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| Variable speed feed mechanism | 
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| Patentees: |  
 | Willard E. Gerbing (exact or similar names) - Chicago, IL |  | Lorenz J. Andresen (exact or similar names) - Chicago, IL |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Oct. 06, 1939 |  
| Granted: | Dec. 15, 1942 |  USPTO (New site tip)
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                        Jeff Joslin
 Vintage Machinery entry for Gerbing Mfg. Co.
 
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| Description: |  | Of interest primarily because co-inventor Willard Gerbing went on to establish Gerbing Mfg. Co., makers of a variable-speed drive mechanism. This particular variable-speed mechanism was intended for feeding material into a mill for grinding. |  |