Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B19/00—Teaching not covered by other main groups of this subclass
Vorrichtung, welche Zeichen beliebiger Art in vorbestimmten, regelbaren Zeitabstaenden oder mit vorbestimmter, regelbarer Geschwindigkeit sichtbar macht und verschwindenlaesst