IPC Definitions - January 01, 2012
G09F 27/00 - Definition
This main group covers:
Combinations of visual and audible advertising or displaying, e.g. for public address.
Attention is drawn to the following places, which may be of interest for search:
mobile visual advertising | G09F 21/00 |
audible advertising | G09F 25/00 |
public address systems | H04R 27/00 |