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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1984-01-31 | 4,428,219 |
| 1984-01-31 | 4,428,446 |
| 1984-01-31 | 4,428,701 |
| 1984-01-31 | 4,428,910 |
| 1984-01-31 | 4,428,947 |
| 1984-01-31 | 4,429,086 |
| 1984-01-31 | 4,429,101 |