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| D. 293023 | Giurtino | Dec 1987 | |
| D. 326522 | Arnoy et al. | May 1992 | |
| 5189609 | Tivig et al. | Feb 1993 | |
| 5391187 | Freeman | Feb 1995 | |
| 5935152 | Merry et al. | Aug 1999 | |
| 6141584 | Rockwell et al. | Oct 2000 |
| Entry |
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