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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-03-16 | 5,193,303 | 
| 1993-03-16 | 5,193,309 | 
| 1993-03-16 | 5,194,507 | 
| 1993-03-16 | 5,194,849 | 
| 1993-03-16 | 5,194,883 | 
| 1993-03-16 | 5,195,047 |