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| Number | Title | Issue Date |
| 5279292 | Charging system for implantable hearing aids and tinnitus maskers Charging system for implantable hearing aids and tinnitus maskers with a repeatedly rechargeable direct voltage source. The charging system comprises an implantable receiving resonant circuit as the electrical energy source for the direct voltage source t... | 01/18/1994 |
| 5277694 | Electromechanical transducer for implantable hearing aids Electromechanical transducer for implantable hearing aids. The transducer has a hermetically sealed and biocompatible housing, in which a wall is designed as a membrane that can oscillate, and which forms a heteromorphic connecting element together with a... | 01/11/1994 |
