首页>
外国专利>
METHOD OF IMPROVING TONE QUALITY AND PIEZOOELECTRIC DIRECT EFFECT OF DIRECT VIBRATION MICROPHONE OF INSTRUMENT UTILIZING PIEZOOELECTRIC DIRECT EFFECT OF AUDIBLE FREQUENCY BAND PIEZOOELECTRIC ELEMENT A
METHOD OF IMPROVING TONE QUALITY AND PIEZOOELECTRIC DIRECT EFFECT OF DIRECT VIBRATION MICROPHONE OF INSTRUMENT UTILIZING PIEZOOELECTRIC DIRECT EFFECT OF AUDIBLE FREQUENCY BAND PIEZOOELECTRIC ELEMENT A