Pesawat penerima radio, televisi, tape recorder, video, tape recorder, mesin bicara, gramaphone, pick up, rewinder, amplifier, loudspeaker, microphone, megaphone, headphone, wireless, optik, kacamata, lensa-lensa, mikroskop, teropong, teleskop, pesawat komunikasi, telephone, airphone, walky talky, handytalky, pesawat telex, faxsimili, pita-pita magnetik, pita cassette, antena, booster, accu baterai, transformator, komputer, pesawat-pesawat ukur, spedo, amperemeter, meteran listrik, stop kontak, saklar, switch, fitting, panel listrik