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| D345684 | Shaanan | Apr 1994 | |
| D391828 | Carsello | Mar 1998 | |
| D393994 | Hankel et al. | May 1998 | |
| 3688531 | Hawkins | Sep 1972 | |
| 4109948 | Potter et al. | Aug 1978 | |
| 4561684 | Marotto | Dec 1985 | |
| 4679416 | Kambic | Jul 1987 | |
| 4739638 | Lin | Apr 1988 | |
| 4873853 | Foshee | Oct 1989 |