| http://www.w3.org/ns/prov#value | - The above and other objects of this invention will become more fully apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: ice FIGURE 1 is a cross section of a tank or reservoir indicating the position and extent of a typical vortex action; FIGURE 2 is a view similar to FIGURE 1 partially in section showing the action of the present invent
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