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29 39 550 | Apr 1980 | DE |
195 41 788 | May 1997 | DE |
0 219 928 | Apr 1987 | EP |
0 271 872 | Jun 1988 | EP |
0 599 023 | Jun 1994 | EP |
WO 9118859 | Dec 1991 | WO |
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