| 摘要 |
PROBLEM TO BE SOLVED: To obtain a trommel which can classify three kinds at a time. SOLUTION: The outer side part of a trommel body having a sieving net is fitted with a sieving net spread with a net of the mesh finer than the mesh of the trommel net and the materials sorted by the trommel are further subjected to grain size sorting by this sieving net.
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