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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-01-26 | 5,181,892 | 
| 1993-01-26 | 5,181,960 | 
| 1993-01-26 | 5,182,108 | 
| 1993-01-26 | 5,182,167 | 
| 1993-01-26 | 5,182,365 | 
| 1993-01-26 | 5,182,637 | 
| 1993-01-26 | 5,182,653 | 
| 1993-01-26 | 5,182,689 | 
| 1993-01-26 | 5,182,692 | 
| 1993-01-26 | 5,182,804 |