IPC Definitions - January 01, 2012
E21B 47/002 - Definition
This group covers:
Processes or apparatus using images obtained by electrical, optical, acoustical or other methods, e.g. using a camera for observation.
Attention is drawn to the following places, which may be of interest for search:
Photographing internal surfaces, e.g. of pipes | G03B 37/00 |
Closed circuit television systems | H04N 7/18 |