Stabilizer, pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, rewinder, amplifier, loud speaker, microphone, megaphone, headphone, wireless untuk telepon, optik, kaca mata dan bagian-bagiannya, lensa-lensa, mikroskop, terop ong, teleskop, pesawat telekomunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, anthenna, booster, accu, baterai, batu baterai, travo, ballast, stepup, stepdown, komputer, mesin hitung, kalkulator, speedometer, ampere meter, meteran l istrik, volta meter