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| Number | Date | Country |
|---|---|---|
| 3925871 | Feb 1991 | DEX |
| 0639089 | Mar 1962 | ITX |
| 0577838 | Mar 1993 | JPX |
| 5330561 | Dec 1993 | JPX |
| 6127552 | May 1994 | JPX |
| 6179454 | Jun 1994 | JPX |
| WO 9221581 | Dec 1992 | WOX |
| WO 9523742 | Sep 1995 | WOX |
| WO 9533663 | Dec 1995 | WOX |