IPC Definitions - January 01, 2012
G09F 25/00 - Definition
This main group covers:
Advertising in audible form.
References relevant to classification in this main group
This main group does not cover:
combined visual and audible advertising | G09F 27/00 |
Attention is drawn to the following places, which may be of interest for search:
sound-recording or reproducing in general | G11B |
public address systems | H04R 27/00 |