| http://www.w3.org/ns/prov#value | - As it will be explained later in detail in conjunction with FIGS. 6A through 6C, at the strong water current, the recess time inserted between the positive and reverse rotations of the pulsator is relatively shorter, for example, such as 0.2 seconds", while at the normal water current such recess time is set, for example, at 0.5 seconds", and at the weak water current the recess time is further
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