| Number | Date | Country | Kind |
|---|---|---|---|
| 10-36565 | Dec 1998 | JPX |
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| D320003 | Komatsu | Sep 1991 | |
| D416541 | Hirai et al. | Nov 1999 | |
| 5139435 | Komatsu et al. | Aug 1992 | |
| 5389001 | Broschard, III et al. | Feb 1995 | |
| 5492481 | Lewis | Feb 1996 | |
| 5954522 | Ho et al. | Sep 1999 | |
| 5967803 | Ho | Oct 1999 | |
| 5967813 | Ho et al. | Oct 1999 | |
| 5967845 | Ho et al. | Oct 1999 |