| http://www.w3.org/ns/prov#value | - If variable volume containers are used to serve both media (which is advantageous in any case, and especially if both media are liquids) then it is advantageous to use an arrangement (FIG. 8C) where the bistable membrane 101 forms a partition wall between two compartments of a single container 104, the two compartments containing different media, assuring that the volume changes in both sides of m
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