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| Number | Title | Issue Date |
| 7149497 | Radio signal receiving device The radio signal receiving device that has an input terminal for inputting an input signal and an output terminal for amplifying the signal inputted to the input terminal and then outputting the signal, comprises an insulating container comprising the input terminal... | 12/12/2006 |
| 4739511 | Hearing aid A hearing aid having a comparator or comparators which compare speech sound signals obtained by a first transducer with reference voltage(s) as slice level(s) formed from a standard voltage and which output time series square wave containing frequency inf... | 04/19/1988 |
