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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-05-14 | 5,014,410 |
| 1991-05-14 | 5,014,986 |
| 1991-05-14 | 5,015,012 |
| 1991-05-14 | 5,015,246 |
| 1991-05-14 | 5,015,258 |
| 1991-05-14 | 5,015,407 |
| 1991-05-14 | 5,015,482 |
| 1991-05-14 | 5,015,727 |
| 1991-05-14 | 5,015,734 |
| 1991-05-14 | 5,015,735 |
| 1991-05-14 | 5,015,771 |
| 1991-05-14 | 5,016,013 |