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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-08-24 | 5,237,958 | 
| 1993-08-24 | 5,238,703 | 
| 1993-08-24 | 5,238,918 | 
| 1993-08-24 | 5,238,943 | 
| 1993-08-24 | 5,239,011 | 
| 1993-08-24 | 5,239,067 | 
| 1993-08-24 | 5,239,371 | 
| 1993-08-24 | 5,239,461 | 
| 1993-08-24 | 5,239,513 | 
| 1993-08-24 | 5,239,525 | 
| 1993-08-24 | 5,239,645 | 
| 1993-08-24 | 5,239,655 |