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| Withdrawn Patents | |
| Grant Date | Patent Number | 
| 1993-10-12 | D340,225 | 
| 1993-10-12 | 5,251,812 | 
| 1993-10-12 | 5,252,172 | 
| 1993-10-12 | 5,252,227 | 
| 1993-10-12 | 5,252,368 | 
| 1993-10-12 | 5,252,702 | 
| 1993-10-12 | 5,252,896 |