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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1988-11-15 | 4,784,176 |
| 1988-11-15 | 4,784,683 |
| 1988-11-15 | 4,784,698 |
| 1988-11-15 | 4,784,826 |
| 1988-11-15 | 4,785,011 |
| 1988-11-15 | 4,785,056 |