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| Number | Date | Country |
|---|---|---|
| 0 014 300 A1 | Aug 1980 | EPX |
| 0 324 578 A1 | Jul 1989 | EPX |
| 0 370 600 A1 | May 1990 | EPX |
| 2687912 A1 | Sep 1993 | FRX |
| 58-132074 | Aug 1983 | JPX |
| 6-241575 | Aug 1994 | JPX |
| 7-124192 | May 1995 | JPX |
| 7-194642 | Aug 1995 | JPX |
| 2 205 496 | Dec 1988 | GBX |
| WO 9318724 | Sep 1993 | WOX |
| WO 9400087 | Jan 1994 | WOX |
| WO 9412125 | Jun 1994 | WOX |