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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-12-24 | 5,075,013 |
| 1991-12-24 | 5,075,328 |
| 1991-12-24 | 5,075,441 |
| 1991-12-24 | 5,075,741 |
| 1991-12-24 | 5,075,774 |
| 1991-12-24 | 5,075,829 |