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EP0251785B1_1987.pdf
418911
EP0494869B1_1990.pdf
429567
EP0556324B1_1991.pdf
361795
US4622499_1985.pdf
2702146
US4628379_1984.pdf
821874
US4639863_1985.pdf
3339726
US4825321_1987.pdf
1424090
US4979055_1989.pdf
3380082
US4979056_1987.pdf
1179300
US5050016_1989.pdf
824982
US5121262_1991.pdf
931193
US5521768_1994.pdf
1783202
US6279108_1993.pdf
3149154