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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1992-11-17 | 5,163,610 |
| 1992-11-17 | 5,163,653 |
| 1992-11-17 | 5,163,998 |
| 1992-11-17 | 5,164,061 |
| 1992-11-17 | 5,164,269 |
| 1992-11-17 | 5,164,721 |
| 1992-11-17 | 5,165,000 |
| 1992-11-17 | 5,165,035 |