(under subclass 162) Subject matter wherein the energy is sonic or ultrasonic waves.
SEE OR SEARCH CLASS
73, Measuring and Testing,
596+, for similar apparatus utilizing acoustic wave energy to produce an image corresponding to the acoustic properties (e.g., absorption, reflection) of a viewed object.
340, Communications: Electrical,
850+, for compressional wave systems in an underwater environment.
367, Communications, Electrical: Acoustic Wave Systems and Devices,
