(under subclass 686.1) Subject matter responsive to the position of parts of the earth relative to other parts of the earth.
(1) Note. This subclass includes, for example, position of mine roofs, earthquake faults, etc.
SEE OR SEARCH THIS CLASS, SUBCLASS:
855.3, for signaling in a wellbore telemetering system.
SEE OR SEARCH CLASS
73, Measuring and Testing,
784, for earth stress measurement.
166, Wells, 64, for a well with time or distance measuring or temperature responsive or counting means; and subclass 66 for a well with electrical indicating means.
175, Boring or Penetrating The Earth,
40+, for such subject matter which is particularly described and combined with signalling or indicating means.
324, Electricity: Measuring and Testing,
323+, for determining an electrical characteristic of the subsurface of the earth, in situ.
367, Communications, Electrical: Acoustic Wave Systems and Devices,
