| Number | Date | Country | Kind |
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| 2005-023912 | Aug 2005 | JP | national |
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| 6937819 | Brough | Aug 2005 | B2 |
| Number | Date | Country |
|---|---|---|
| HA16003680 | Apr 2004 | JP |
| 1249383 | Aug 2005 | JP |