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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-09-03 | RE33,684 |
| 1991-09-03 | 5,044,099 |
| 1991-09-03 | 5,045,270 |
| 1991-09-03 | 5,045,600 |
| 1991-09-03 | 5,045,606 |
| 1991-09-03 | 5,045,690 |
| 1991-09-03 | 5,045,863 |
| 1991-09-03 | 5,046,134 |