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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-03-09 | 5,191,812 | 
| 1993-03-09 | 5,192,017 | 
| 1993-03-09 | 5,192,299 | 
| 1993-03-09 | 5,192,575 | 
| 1993-03-09 | 5,192,614 | 
| 1993-03-09 | 5,192,670 | 
| 1993-03-09 | 5,192,769 | 
| 1993-03-09 | 5,192,796 | 
| 1993-03-09 | 5,192,967 | 
| 1993-03-09 | 5,193,040 | 
| 1993-03-09 | 5,193,123 | 
| 1993-03-09 | 5,193,155 |