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| Number | Date | Country |
|---|---|---|
| 3339988 | May 1985 | DE |
| 0579384 | Jan 1994 | EP |
| 0613650 | Sep 1994 | EP |
| 1584365 | Feb 1981 | GB |
| 2002039468 | Feb 2002 | JP |
| 0121995 | Mar 2001 | WO |
| 0123025 | Apr 2001 | WO |
| 0124861 | Apr 2001 | WO |
| Entry |
|---|
| JP 2002039468, Feb. 6, 2002 (Abstract only—English version). |
| DE 3339988, May 15, 1985 (Abstract only—English version). |