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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1984-08-21 | 4,467,058 |
| 1984-08-21 | 4,467,059 |
| 1984-08-21 | 4,467,069 |
| 1984-08-21 | 4,467,076 |
| 1984-08-21 | 4,467,135 |
| 1984-08-21 | 4,467,228 |