INTERACOUSTICS

[ AUDITORY AMPLIFIERS, APPARATUS FOR VISUAL AND TACTILE INDICATION OF PITCH AND VISUAL INDICATION OF SOUNDS FOR TRAINING IN ARTICULATION, APPARATUS FOR TRANSPOSING SPEECH FREQUENCIES INTO LOW FREQUENCY RANGE, APPARATUS FOR TACTILE SPEECH TRANSMISSION BY VIBRATORS CONNECTED TO AN ELECTRONIC FREQUENCY FILTER SYSTEM, VISIBLE SPEECH DISPLAYS FOR ARTICULATION TRAINING OF THE TOTALLY DEAF, ] AUDIOMETER FOR INDICATION OF HEARING LOSS, [ SPEECH UNIT FOR SPEECH AUDIOMETRY ] AND AUDIOMETER EARPHONES