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| Number | Date | Country |
|---|---|---|
| 851479 | Sep 1970 | CA |
| 655237 | Apr 1987 | CH |
| 1466963 | May 1969 | DE |
| 2409752 | Sep 1975 | DE |
| 2545936 | Apr 1977 | DE |
| 2910982 | Feb 1980 | DE |
| 0023672 | Jul 1980 | EP |
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| 2654627 | May 1991 | FR |
| 1182031 | Feb 1970 | GB |
| 2018605 | Oct 1979 | GB |
| WO2004021958 | Mar 2004 | WO |
| WO04039205 | May 2004 | WO |