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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-05-18 | 5,211,016 | 
| 1993-05-18 | 5,211,210 | 
| 1993-05-18 | 5,211,361 | 
| 1993-05-18 | 5,211,588 | 
| 1993-05-18 | 5,211,676 | 
| 1993-05-18 | 5,211,773 | 
| 1993-05-18 | 5,212,007 | 
| 1993-05-18 | 5,212,141 | 
| 1993-05-18 | 5,212,149 | 
| 1993-05-18 | 5,212,190 | 
| 1993-05-18 | 5,212,479 |