Sungkup las listrik, elektroda pengelasan listrik (welding electrodes), alat pengelas listrik, alat pengelas busur cahaya, kawat listrik, pesawat penerima radio, televisi, tape recorder, video, VCD, DVD, mesin bicara, gramaphone, pickup, rewinder, amplifier, loud speaker, speaker mobil, microphone, megaphone, headphone, wireless, optik, kaca mata, lensa-lensa, mikroskop, teropong, teleskop, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, pita-pita magnetik, pita cassete, pita video disk recorder, laser disk, piringan hitam, compact disk (audio, video), antena, booster, radar, parabola, accu, baterai, batu baterai, bel listrik, kabel telepon, transformator, travo, ballast, stepup, stepdown, mesin faksimili, komputer, mesin hitung, kalkulator, kas register, mesin teleks, printer, pesawat-pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, modem-modem,monitor (program komputer), cpu, stop kontak, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecker, sonar, seterika listrik, mesin fotocopy, disket, pesawat-pesawat pemadam api, alat solder listrik