(under subclass 253) Subject matter which includes apparatus to bore a well and includes methods corresponding to the apparatus.
SEE OR SEARCH CLASS
166, Wells,
247, for processes of treating wells using nuclear energy or radioactivity; subclasses 250+ for processes including wells, in combination with indicating, testing or measuring and subclass 66 for apparatus in combination with a well for giving electrical signals concerning something in relation to the well. See also section VI of the general notes to Class 166.
175, Boring or Penetrating the Earth, particularly
41, for the combination of boring or drilling with a radiant energy test. See subclass 40, (3) Note for the line between Class 250 and Class 175.
