Pesawat penerima radio, televisi, tape recorder, video, ìVCD, DVD, mesin bicara, gramaphone, pickup, rewinder,amplifier, ìloud speaker, speaker mobil, microphone, megaphone, headphone, ìwireless, optik, kaca mata, lensa-lensa, mikroskop, teropong, ìteleskop, pesawat komunikasi, telephone, airphone, walky talky, ìhandy talky, pesawat telex, pita-pita magnetik, pita cassette, ìpita video disk recorder, laser disk, piringan hitam, compact ìdisk (audio, video), antena, booster, radar, parabola, accu, ìbaterai,batu baterai, bel listrik, kabel telepon,transformator, ìtravo, ballast, stepup, stepdown,mesin faksimili,komputer,mesin ìhitung, kalkulator, kas register, mesin teleks,printer,pesawat- ìpesawat ukur, speedometer, ampere meter, meteran listrik, volta ìmeter, modem-modem, monitor (program komputer),cpu,stop kontak, ìsakelar,switch-switch, fiting-fiting, kombinasi fiting,stecker, ìsonar, seterika listrik, mesin fotocopy, disket,pesawat-pesawat ìpemadam api, alat solder listrik