US patent class 455: telecommunications
US patent class 455: telecommunications [detailed definition]
Topics include: telephones, radio and other wireless transmissions, transmitters and receivers, relays and content filters, signal converters, …
US patent class 455: telecommunications
US patent class 455: telecommunications [detailed definition]
Topics include: telephones, radio and other wireless transmissions, transmitters and receivers, relays and content filters, signal converters, …