| http://www.w3.org/ns/prov#value | - FIG. 2A is a schematic diagram illustrating a top view of the ultrasonic transmission device, called transducer, according to the first preferred embodiment of the present invention, and FIG. 2B is a schematic diagram illustrating a cross-sectional view of the transducer of FIG. 2A. The ultrasonic transducer includes (1) a plate 21; (2) a lower frequency transducer (TLF) 22; (3) a first plate thic
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