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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-03-12 | 4,998,481 |
| 1991-03-12 | 4,998,854 |
| 1991-03-12 | 4,999,028 |
| 1991-03-12 | 4,999,123 |
| 1991-03-12 | 4,999,214 |
| 1991-03-12 | 4,999,490 |
| 1991-03-12 | 4,999,605 |