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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1993-01-26 | 5,181,892 |
| 1993-01-26 | 5,181,960 |
| 1993-01-26 | 5,182,108 |
| 1993-01-26 | 5,182,167 |
| 1993-01-26 | 5,182,365 |
| 1993-01-26 | 5,182,637 |
| 1993-01-26 | 5,182,653 |
| 1993-01-26 | 5,182,689 |
| 1993-01-26 | 5,182,692 |
| 1993-01-26 | 5,182,804 |