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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1984-09-25 | 4,473,138 |
| 1984-09-25 | 4,473,224 |
| 1984-09-25 | 4,473,357 |
| 1984-09-25 | 4,473,659 |
| 1984-09-25 | 4,473,791 |
| 1984-09-25 | 4,473,823 |