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Rem, P.C. (author), Fraunholcz, N.O. (author), Van Kooy, L.A. (author)The invention relates to a method of separating a particle fraction from a particle stream making use of gravitational force and which is performed in a fluid. This provides particle fractions that are collected in respective collecting means. According to the invention the fluid and the collecting means are moved in relation to each other...patent 2002