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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1989-09-05 | RE33,049 |
| 1989-09-05 | 4,862,522 |
| 1989-09-05 | 4,862,880 |
| 1989-09-05 | 4,863,192 |
| 1989-09-05 | 4,863,659 |
| 1989-09-05 | 4,863,913 |
| 1989-09-05 | 4,864,053 |