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| 5629214 | Crosby | May 1997 | |
| 5639424 | Ravsnitz | Jun 1997 | |
| 5658801 | Possani et al. | Aug 1997 | |
| 5698450 | Ringrese et al. | Dec 1997 | |
| 5723345 | Yamauchi et al. | Mar 1998 | |
| 5766937 | Lahm et al. | Jun 1998 | |
| 5783446 | Saul et al. | Jul 1998 |