Electronic modules for exchanging data, sounds, still or motion pictures, messages, notably for mobile radiotelephone equipments; apparatus for recording, transmission or reproduction of sound or images or data; apparatus for transmitting, broadcasting, receiving data, sounds, still or motion pictures, messages; telephone and radiotelephone installations, apparatus, transmitters and receivers, notably of the mobile, portable or fixed types; answering sets, modems; paging sets; telephone exchanges; paging or radio telephone repeaters; pylons for wireless telephone; satellites and antennas, notably for broadcasting, transmitting and receiving data, sounds, still or motion pictures, messages; data processing equipment and computers; audio-video terminals, multimedia terminals; local area networks; integrated circuits, microprocessors, printed boards; electrical accumulators