IPC Definitions - January 01, 2012
H04Q 1/00 - Definition
Attention is drawn to the following places, which may be of interest for search:
Details of selector switches | H01H 63/00 |
Cables; Conductors | H01B |
Installation of communication cables or lines | H02G |
Multiplex systems providing for calling or supervisory signals | H04J 1/00, H04J 3/12 |
Telephone substation equipment | H04M 1/00 |
Current supply arrangements for telephone systems | H04M 19/00 |
In patent documents the following abbreviations are often used:
MDF | Main Distribution Frame |