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
Verfahren und Vorrichtung zum Herstellen des Gleichlaufs zwischen der Lautwiedergabe mittels drahtlosen oder Draht-Fernsprechers und lichtbildlicher Darstellung