ELECTRICAL AND/OR ELECTRONIC APPARATUS FOR RECORDING, TRANSMITTING AND REPRODUCING SOUNDS, NAMELY, ACOUSTIC ALARMS, VOICE SYNTHESIZERS, STEREO AMPLIFIERS, STEREO RECEIVERS, STEREO TUNERS, HEAD-BAND ACOUSTIC RECEIVERS, RADIO RECEIVERS, RADIO TRANSMITTERS; AUDIO RECEIVERS, AUDIO TRANSMITTERS, MICROPHONES, DICTATING MACHINES, TELEPHONES AND TELEPHONE APPARATUS, ACOUSTIC POSITIONING AND ORIENTATION DEVICES; UNDERWATER TRANSMITTERS AND/OR RECEIVERS, EITHER WIRED OR WIRELESS, FOR COMMUNICATION BETW...