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| Withdrawn Patents | |
| Grant Date | Patent Number |
| 1973-01-09 | 3,709,688 |
| 1973-01-09 | 3,710,004 |
| 1973-01-09 | 3,710,344 |
| 1973-01-09 | 3,710,345 |
| 1973-01-09 | 3,710,346 |
| 1973-01-09 | 3,710,347 |