(under the class definition) Subject matter wherein information or control signals are transmitted through a passageway in the earth in the form of acoustic waves in a medium in the passageway comprised of material different from the surrounding earth.
SEE OR SEARCH THIS CLASS, SUBCLASS:
25, for wellbore telemetering of this subclass type combined with acoustic well logging means.
SEE OR SEARCH CLASS
33, Geometrical Instruments,
306+, for acoustic wave wellbore telemetering systems combined with gravity or earth's magnetic field responsive means to determine and indicate the direction or inclination of the wellbore.
340, Communications: Electrical, 853.1+, for nonacoustic wave wellbore telemetering, particularly subclasses 855.6 and 856.4 for an acoustic transducer with a nonacoustic communication link; and subclasses 870.01+ for generic telemetering systems.
