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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-06-01 | 5,214,862 | 
| 1993-06-01 | 5,215,186 | 
| 1993-06-01 | 5,215,224 | 
| 1993-06-01 | 5,215,252 | 
| 1993-06-01 | 5,215,687 | 
| 1993-06-01 | 5,215,742 | 
| 1993-06-01 | 5,215,911 | 
| 1993-06-01 | 5,216,000 | 
| 1993-06-01 | 5,216,027 | 
| 1993-06-01 | 5,216,108 | 
| 1993-06-01 | 5,216,184 | 
| 1993-06-01 | 5,216,208 | 
| 1993-06-01 | 5,216,311 |