IPC Definitions - January 01, 2012
E21B 47/026 - Definition
This group covers:
Processes or apparatus for finding the slant of the drilled formation strata or the path of the drilled formation strata with respect to magnetic north.
Attention is drawn to the following places, which may be of interest for search:
Formation testing | E21B 49/00 |
Apparatus for obtaining oriented cores | E21B 25/16 |