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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1992-04-07 | RE33,871 |
| 1992-04-07 | 5,101,535 |
| 1992-04-07 | 5,101,749 |
| 1992-04-07 | 5,102,334 |
| 1992-04-07 | 5,102,430 |
| 1992-04-07 | 5,102,622 |
| 1992-04-07 | 5,102,801 |
| 1992-04-07 | 5,102,823 |
| 1992-04-07 | 5,103,240 |
| 1992-04-07 | 5,103,252 |
| 1992-04-07 | 5,103,258 |
| 1992-04-07 | 5,103,372 |