A dual coil floating mass transducer for assisting a person's hearing is provided. Inertial vibration of the housing of the floating mass transducer produces vibrations in the inner ear. A magnet is disposed within the housing biased by silicone springs so that friction is reduced between the magnet...http://www.google.fr/patents/US5897486?utm_source=gb-gplus-shareBrevet US5897486 - Dual coil floating mass transducers
