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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-02-23 | 5,187,906 | 
| 1993-02-23 | 5,187,961 | 
| 1993-02-23 | 5,188,391 | 
| 1993-02-23 | 5,188,656 | 
| 1993-02-23 | 5,188,722 | 
| 1993-02-23 | 5,188,843 | 
| 1993-02-23 | 5,188,847 | 
| 1993-02-23 | 5,188,932 | 
| 1993-02-23 | 5,189,002 | 
| 1993-02-23 | 5,189,024 | 
| 1993-02-23 | 5,189,059 | 
| 1993-02-23 | 5,189,699 |