| http://www.w3.org/ns/prov#value | - A distance between the end surface 2 a and 2 b is preferably about ??/2???N, where ?? is a wavelength of a surface acoustic wave to be excited by the interdigital transducer 3 and N is an integer greater than one so that the excited wave becomes a standing wave between the end surfaces 2 a and 2 b.
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