| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS [0021] The invention is described in more detail below, by way of example, with reference to an embodiment shown in the drawings, in which: [0022]FIG. 1 is a section through a double membrane pump with the reversing system in accordance with the invention; [0023]FIG. 2 is a section through part of the reversing system of FIG. 1 shortly before the change in positio
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