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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1992-09-08 | 5,144,783 |
| 1992-09-08 | 5,144,865 |
| 1992-09-08 | 5,145,672 |
| 1992-09-08 | 5,145,881 |
| 1992-09-08 | 5,145,969 |
| 1992-09-08 | 5,146,060 |
| 1992-09-08 | 5,146,128 |
| 1992-09-08 | 5,146,218 |
| 1992-09-08 | 5,146,350 |
| 1992-09-08 | 5,146,530 |