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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1990-01-30 | 4,896,608 |
| 1990-01-30 | 4,896,743 |
| 1990-01-30 | 4,897,078 |
| 1990-01-30 | 4,897,271 |
| 1990-01-30 | 4,897,679 |
| 1990-01-30 | 4,897,701 |