(under the class definition) Subject matter having means for sending out a sound wave and receiving said wave after a reflection being utilized to add some information to the original wave.
(1) Note. Except for mechanical altitude or depth detectors in subclass 124 below, this subclass does not provide for mechanical systems relating to identifying geologic or subsurface structure which is provided for by subclass 101 above.
SEE OR SEARCH THIS CLASS, SUBCLASS:
101+, for systems for identifying geologic or subsurface structure (see (1) Note above).
SEE OR SEARCH CLASS
73, Measuring and Testing, 620+, and 627+ for means for testing a body utilizing a wave reflected from a surface of a body.
342, Communications: Directive Radio Wave Systems and Devices (e.g., Radar, Radio Navigation), appropriate subclass for reflected or otherwise returned radio wave systems.
367, Communications, Electrical: Acoustic Wave Systems and Devices,