accu, baterai, batu baterai, bel listrik, kabel telepon, anthenna, booster, radar, parabola, optik, kacamata dan bagian-bagiannya, lensa - lensa, disket, mikroskop, teropong, teleskop, pesawat - pesawat ukur, speedometer, ampere meter, meteran listrik, volta meter, modem-modem, monitor (program komputer), CPU, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, Pesawat penerima radio, televisi, tape recorder, video, mesin bicara, gramaphone, pickup, microphone, megaphone, head-phone, wireless, VCD, pita-pita magnetik, pita cassette, pita video disk recorder, laser disk, piringan hitam, compact disk (audio, video), stop kontak, sakelar, switch-switch, fitting-fitting, kombinasi fiting, stecker, sonar, vacuum cleaner (alat pembersih debu), mesin fotocopy pesawat-pesawat pemadam api, alat solder listrik, rewinder, amplifier, loud speaker, transformator, travo, ballast, step up, step down, mesin faxsimil, mesin telex, printer