| http://www.w3.org/ns/prov#value | - If now a medium such as a gas or a liquid is supplied under pressure in the hose-surrounding space 4, via an opening 20 diagrammatically shown in FIG. 1, as a result of the pressure exerted on the hose wall, the hose will be compressed starting at the weakening, after which the flattening movement is continued in the direction of the other hose end, thereby forcing the pumpable material present in
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