Electrical apparatus for line telephony or line telegraphy, namely, telephone sets; videophones; facsimile machines; cellular phones; personal handyphones; apparatus and instruments for processing, reproducing, transmitting and recording sound or images namely, radio-broadcasting receivers; television sets; video monitors; microphones; silicon microphones; loudspeakers; woofers; sub-woofers; headphones, earphones; mini audio systems comprising amplifiers, loudspeakers and optical disk players...