Pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, pickup, rewinder, amplifier, loud speaker, microphone, megaphone, headphone, wireless Optik, kaca mata dan bagian-bagiannya, lensa-lensa, mikroskop teropong, teleskop, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, pita-pita magnetik, pita cassette, pita video disk recorder, laser disk, piringan hitam, anthenne, booster, radar, parabola, Accu, baterai, batu baterai, trnsformotor, travo, ballast,stepup, stepdown, komputer, mesin hitung, kalkulator, kas register, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter