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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1992-08-11 | 5,136,991 |
| 1992-08-11 | 5,137,095 |
| 1992-08-11 | 5,137,143 |
| 1992-08-11 | 5,137,199 |
| 1992-08-11 | 5,137,451 |
| 1992-08-11 | 5,137,719 |
| 1992-08-11 | 5,137,757 |
| 1992-08-11 | 5,137,883 |
| 1992-08-11 | 5,137,968 |
| 1992-08-11 | 5,138,094 |
| 1992-08-11 | 5,138,536 |