| Number | Name | Date | Kind |
|---|---|---|---|
| 6032162 | Burke | Feb 2000 | A |
| 6163778 | Fogg et al. | Dec 2000 | A |
| 6314423 | Himmel et al. | Nov 2001 | B1 |
| 6321228 | Crandall et al. | Nov 2001 | B1 |
| 6324566 | Himmel et al. | Nov 2001 | B1 |
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