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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-01-12 | 5,178,296 | 
| 1993-01-12 | 5,178,437 | 
| 1993-01-12 | 5,178,740 | 
| 1993-01-12 | 5,178,741 | 
| 1993-01-12 | 5,178,929 | 
| 1993-01-12 | 5,179,133 | 
| 1993-01-12 | 5,179,209 | 
| 1993-01-12 | 5,179,226 | 
| 1993-01-12 | 5,179,403 | 
| 1993-01-12 | 5,179,616 |