| http://www.w3.org/ns/prov#value | - on relates to a pump for liquids, which is driven by an electromagnetic alternating field, and particularly concerns a circulating pump driven in said manner for aquariums, which pump is preceded by a filter. j The invention furthermore concerns such pumps which are provided with a pipe which for guiding the liquid is movable in a transverse direction, said pipe being adapted by an electromagnet a
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