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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-09-17 | 5,048,205 |
| 1991-09-17 | 5,048,576 |
| 1991-09-17 | 5,049,226 |
| 1991-09-17 | 5,049,356 |
| 1991-09-17 | 5,049,660 |
| 1991-09-17 | 5,049,712 |
| 1991-09-17 | 5,049,719 |