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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-08-10 | 5,233,819 | 
| 1993-08-10 | 5,234,254 | 
| 1993-08-10 | 5,234,273 | 
| 1993-08-10 | 5,234,415 | 
| 1993-08-10 | 5,234,446 | 
| 1993-08-10 | 5,234,461 | 
| 1993-08-10 | 5,234,629 | 
| 1993-08-10 | 5,234,630 | 
| 1993-08-10 | 5,234,749 | 
| 1993-08-10 | 5,235,002 | 
| 1993-08-10 | 5,235,040 | 
| 1993-08-10 | 5,235,048 | 
| 1993-08-10 | 5,235,080 | 
| 1993-08-10 | 5,235,403 |