| Number | Date | Country | Kind |
|---|---|---|---|
| 641899-0001 | Dec 2006 | EM | regional |
| 641899-0002 | Dec 2006 | EM | regional |
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| 4896877 | Moomaw et al. | Jan 1990 | A |
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| 6533672 | Keller et al. | Mar 2003 | B1 |
| Number | Date | Country |
|---|---|---|
| 1364691 | Nov 2003 | EP |
| 215035 | May 1924 | GB |
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| 5115617 | May 1993 | JP |
| WO9532778 | Dec 1995 | WO |