Pesawat telephone, kabel telephone, pesawat penerima radio, televisi, tape rekorder, video, mesin bicara, gramaphone, pickup, rewinder, loudspeaker, microphone, megaphone, headphone, wirelass, VCD, optik, kacamata dan bagian-bagiannya, lensa-lensa, mikros kop, teropong, teleskop, peswat telekomunikasi, airphone, walky talky, handy talky, pesawat telex, pita-pita magnetik, pita cassette, pita video disk, recorder, laser disk, piringan hitam, compact disk (audio, video), anthenna, booster, radar, parabola, accu, baterai, batu baterai, bel listrik, mesin-mesin bicara, transformator, travo, ballast, stepup, stepdown, mesin faksimil, komputer, mesin hitung, kalkulator, kas register, printer, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, vol ta meter, modem-modem, monitor (program komputer), CPU, stop kontak, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecker, sonar, seterika listrik, mesin foto copy, disket, pesawat-pesawat pemadam api, alat solder listrik, vacum cleaner