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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1990-08-28 | RE33,318 |
| 1990-08-28 | 4,952,148 |
| 1990-08-28 | 4,952,238 |
| 1990-08-28 | 4,952,338 |
| 1990-08-28 | 4,952,377 |
| 1990-08-28 | 4,952,427 |
| 1990-08-28 | 4,952,681 |
| 1990-08-28 | 4,952,933 |