Number | Date | Country | Kind |
---|---|---|---|
99201928 | Jun 1999 | EP |
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4818915 | Zaslavsky et al. | Apr 1989 | A |
4987344 | Zaslavsky et al. | Jan 1991 | A |
5563474 | Wessels et al. | Oct 1996 | A |
5811933 | Van Den Nieuwenhuizen et al. | Sep 1998 | A |
5990599 | Jackson et al. | Nov 1999 | A |