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| 4944122 | Wendt | Jul 1990 | |
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| 5065556 | DeLong et al. | Nov 1991 | |
| 5172530 | Fishel et al. | Dec 1992 | |
| 5209035 | Hodges et al. | May 1993 | |
| 5219406 | Raz | Jun 1993 | |
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| 5341615 | Hodges et al. | Aug 1994 | |
| 5394658 | Schreiner et al. | Mar 1995 | |
| 5511349 | Kelley et al. | Apr 1996 | |
| 5670743 | Welch et al. | Sep 1997 | |
| 5715633 | Raz et al. | Feb 1998 | |
| 5746034 | Luchetti et al. | May 1998 | |
| 5813178 | Edwards | Sep 1998 | |
| 5957414 | Perrignon de Troyes et al. | Sep 1999 |