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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-08-17 | 5,236,096 | 
| 1993-08-17 | 5,236,225 | 
| 1993-08-17 | 5,236,441 | 
| 1993-08-17 | 5,236,442 | 
| 1993-08-17 | 5,236,463 | 
| 1993-08-17 | 5,236,508 | 
| 1993-08-17 | 5,236,842 | 
| 1993-08-17 | 5,237,093 | 
| 1993-08-17 | 5,237,119 | 
| 1993-08-17 | 5,237,189 | 
| 1993-08-17 | 5,237,623 |