IPC Subgroup
G09B 5/04 with audible presentation of the material to be studied
Introduced: September 1968
Last revised: January 2006
Full Title
Electrically-operated educational appliances > with audible presentation of the material to be studied
Classification Context
- Section:
- PHYSICS
- Class:
- EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- Subclass:
- EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS