| http://www.w3.org/ns/prov#value | - Apparatus for extracting one constituent from a feed liquid by the use of a solvent which is selective for said one constituent, said apparatus including a housing having therein at least one stage comprising means for thoroughly mixing said feed liquid and said solvent and means for separating said solvent and said feed liquid, a rotary shaft and means to rotate the same, said mixing means includ
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