| US Patent: 4,628,441 
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| Automatic Dynamic Error Compensator | 
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| Patentees: |  
 | Richard Johnstone (exact or similar names) - Brookfield, Waukesha County, WI |  | Edward E. Kirkham (exact or similar names) - Brookfield, Waukesha County, WI |  | Han-Chang Chung (exact or similar names) - West Allis, Milwaukee County, WI |  | Lyle D. Ostby (exact or similar names) - Milwaukee, Milwaukee County, WI |  
 
 
 
 
 
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| Patent Dates: |  
| Applied: | Jan. 29, 1983 |  
| Granted: | Dec. 09, 1986 |  USPTO (New site tip)
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                        Joel Havens
 "Vintage Machinery" entry for Kearney  Trecker Corp.
 
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