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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-05-28 | 5,018,448 |
| 1991-05-28 | 5,018,537 |
| 1991-05-28 | 5,018,802 |
| 1991-05-28 | 5,019,128 |
| 1991-05-28 | 5,019,226 |
| 1991-05-28 | 5,019,528 |