H04N 21/441
Acquiring end-user identification {, e.g. using personal code sent by the remote control or by inserting a card}
Child Classification
Classification Type
Parent Classification
Official Website
Find more entities like H04N 21/441
Use the Golden Query Tool to find similar entities by any field in the Knowledge Graph, including industry, location, and more.
By using this site, you agree to our Terms of Service.