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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-03-02 | 5,189,959 | 
| 1993-03-02 | 5,190,043 | 
| 1993-03-02 | 5,190,144 | 
| 1993-03-02 | 5,190,531 | 
| 1993-03-02 | 5,190,537 | 
| 1993-03-02 | 5,190,621 | 
| 1993-03-02 | 5,190,885 | 
| 1993-03-02 | 5,190,949 | 
| 1993-03-02 | 5,191,107 | 
| 1993-03-02 | 5,191,122 | 
| 1993-03-02 | 5,191,189 | 
| 1993-03-02 | 5,191,194 | 
| 1993-03-02 | 5,191,205 |