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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1991-12-31 | 5,076,019 |
| 1991-12-31 | 5,076,126 |
| 1991-12-31 | 5,077,259 |
| 1991-12-31 | 5,077,262 |
| 1991-12-31 | 5,077,419 |
| 1991-12-31 | 5,077,617 |