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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1984-08-14 | 4,464,938 |
| 1984-08-14 | 4,464,988 |
| 1984-08-14 | 4,465,182 |
| 1984-08-14 | 4,465,466 |
| 1984-08-14 | 4,466,091 |
| 1984-08-14 | 4,466,103 |