G PHYSICS
G09 EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
G09B EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B29/00 Maps; Plans; Charts; Diagrams, e.g. route diagram