| Number | Name | Date | Kind |
|---|---|---|---|
| 4484158 | Roberts et al. | Nov 1984 | A |
| 5284659 | Cherukuri et al. | Feb 1994 | A |
| 5572082 | Sokol | Nov 1996 | A |
| 5933812 | Meyer et al. | Aug 1999 | A |
| 6309717 | Qiu et al. | Oct 2001 | B1 |
| Entry |
|---|
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