| http://www.w3.org/ns/prov#value | - The operation of the apparatus will be explained in regard to the belljar 2 and the structure 3 as follows: The valves V to V are arranged to be successively operated to open and close in the course of rotation of a rotor 20 as will be explained more fully later and, for instance, the arrangement is such as shown in FIG. 2, that one cycle of the operation of the valves is effected for one revoluti
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