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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-01-05 | 5,175,924 | 
| 1993-01-05 | 5,176,045 | 
| 1993-01-05 | 5,176,119 | 
| 1993-01-05 | 5,176,273 | 
| 1993-01-05 | 5,176,498 | 
| 1993-01-05 | 5,176,507 | 
| 1993-01-05 | 5,176,818 | 
| 1993-01-05 | 5,176,846 | 
| 1993-01-05 | 5,176,920 | 
| 1993-01-05 | 5,177,093 |