anti-interference devices [electricity]; transmitters of electronic signals; transmitting sets [telecommunication]; radios; intercommunication apparatus; navigational instruments; radar apparatus; vehicle radios; transmitters [telecommunication]; satellite navigational apparatus; missile warning systems; autonomous navigation systems for ships; electronic data carriers; network communication devices; filters for radio interference suppression; antenna filters; amplifiers; electrical signal attenuators; duplexers; electronic components; radio frequency antennas