| http://www.w3.org/ns/prov#value | - FIG. 5A is a schematic diagram illustrating a top view of the ultrasonic transmission device, called transducer, according to the fourth preferred embodiment of the present invention, and FIG. 5B is a schematic diagram illustrating a side cross-sectional view of the transducer of FIG. 5A. The ultrasonic transducer includes (1) a plate 51; (2) a lower frequency transducer (TLF) 52; (3) a first plat
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