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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1992-09-01 | 5,143,379 |
| 1992-09-01 | 5,143,406 |
| 1992-09-01 | 5,143,482 |
| 1992-09-01 | 5,143,488 |
| 1992-09-01 | 5,143,491 |
| 1992-09-01 | 5,143,565 |
| 1992-09-01 | 5,144,137 |
| 1992-09-01 | 5,144,221 |
| 1992-09-01 | 5,144,347 |
| 1992-09-01 | 5,144,351 |
| 1992-09-01 | 5,144,354 |
| 1992-09-01 | 5,144,436 |