Anthenna, boster, radar, parabola, pesawat penerima radio, televisi, tape recorder, video, amplifier, pesawat komunikasi, telephone, airphone, walky talky, handy talky, pesawat telex, faxsimile, mesin bicara, gramaphone, kabel telephone, kawat telephone, kawat telegram, kabel (listrik), microphone, megaphone, hanphone, headphone, wireless, loud speaker, pita-pita magnetik, pita cassette, pita video disk recorder, laser disk, piringan hitam, accu, baterai, batu baterai, komputer, mesin hitung, kalkulator, kas register, transformotor, travo, ballast, stop kontak, stepup, stepdown, sakelar, switch-switch, fiting-fiting, kombinasi fiting, stecker, optik, kaca mata dan bagian-bagiannya, lensa-lensa, mikroskop, teropong, teleskop, bel listrik, compact disk (audio, video), sinyal, terminal listrik, setrika listrik, radio kendaraan, kamera (fotografi), Persediaan kekuatan (Power supply)