| US Patent: 2,835,172 
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| Rotary Head Milling Attachment | 
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| Patentees: |  
 | Orrin W. Barker (exact or similar names) - New Berlin, Waukesha County, WI |  | Ralph E. Saving (exact or similar names) - Wauwatosa, Milwaukee County, WI |  | Lloyd D. Libby (exact or similar names) - Minneapolis, MN |  
 
 
 
 
| Manufacturer: |  | Not known to have been produced |  
 
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| Patent Dates: |  
| Applied: | Jan. 13, 1955 |  
| Granted: | May 20, 1958 |  USPTO (New site tip)
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                        Joel Havens
 "Vintage Machinery" entry for Kearney & Trecker Co.
 
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