Pesawat penerima radio, televisi, tape recorder, video, ìmesin bicara, gramaphone, pickup, rewinder, amplifier, loud ìspeaker, microphone, megaphone, headphone, wireless, pesawat ìkomunikasi, telephone, airphone,walky talky,handy talky pesawat ìtelex, anthenna, booster, radar, parabola, transformotor,travo, ìballast, stepup, stepdown, komputer, mesin hitung, kalkulator, ìkas register, pita-pita magnetik, pita cassette,pita video disk ìrecorder, laser disk, piringan hitam, optik, kaca mata dan ìbagian-bagiannya, lensa - lensa, mikroskup, teropong, teleskop, ìaccu, baterai, batu baterai,pesawat-pesawat ukur, speedomeeter, ìampere meter, meteran listrik, volta meter