(under subclass 102) Subject matter including means for generating acoustical waves mechanically in the shaft.
SEE OR SEARCH THIS CLASS, SUBCLASS:
108+, for seismic wave generation not limited to a well bore in combination with a receiver.
133+, for seismic wave generation not limited to a well bore.
SEE OR SEARCH CLASS
73, Measuring and Testing,
152.01+, for a determination of a physical characteristic of a borehole by making a measurement which is not purely electrical or purely magnetic and subclass 152.57 for a determination of a physical characteristic of a casing or a cementing by making a measurement which is neither purely electrical nor purely magnetic.
