Televisi, radio, tape recorder, video, video CD, digital CD, laser disc, piringan hitam, pita-pita magnetik, pita cassete, pita video disk recorder, mesin bicara, gramaphone, rewinder, amplifier, loud speaker, microphone, megaphone, headphone, wireless, telephone, airphone, walky talky, handy talky, pesawat telex, facksimili, komputer, mesin hitung, kalkulator, kas register, anthena, booster, radar, parabola, accu, baterai, transformator, travo, ballast, stepup, stepdown, pesawat-pesawat ukur, spedometer, amperemeter, meteran listrik, volta meter, stop kontak, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecker, sekering listrik, sirine, alat pengisi, baterai, optik, kacamata dan bagian-bagiannya, lensa-lensa, mikroskop, teropong, teleskop