| http://www.w3.org/ns/prov#value | - For example, more than one transducer could be used in the embodiments of FIGS. 1,2,3,4,5,6,7,8, and 10, and the frequency and phase of these two transducers could be manipulated with respect to each other to create greater pressure differentials, beat frequency phenomenon, combinations of standing and traveling waves, and other effects which may prove useful in various applications.
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