(under subclass 324) Subject matter relating to the determination of the subsurface location of the point or region of entry of a fluid into or out of a well, borehole, or other opening in the earth.
SEE OR SEARCH CLASS
73, Measuring and Testing,
40.5, for the determination of the leakage or ingress of fluid from or into a conduit in situ and subclasses 152.18+ for a rate of fluid flow measuring or fluid analysis in a borehole or drilling test wherein the measurement or the analysis is not made by purely electrical means or purely magnetic means.
