(under the class definition) Apparatus wherein acoustic energy is used for agitating, fracturing or vibrating.
SEE OR SEARCH CLASS
175, Boring or Penetrating the Earth,
1, for processes or apparatus for boring the earth combined with seismic shock generation and subclass 56 for processes or apparatus for boring the earth including a relationship between the natural vibration characteristics of one boring element and (a) the natural vibration characteristics of another boring element or (b) the frequency of an imposed motion.
