TELEPHONE TRANSMITTER CIRCUIT EMPLOYING VARIABLE CAPACITANCE MICROPHONE,申请号USD3440351-传众专利搜索

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发明名称	TELEPHONE TRANSMITTER CIRCUIT EMPLOYING VARIABLE CAPACITANCE MICROPHONE
摘要
申请公布号	US3440351(A)	申请公布日期	1969.04.22
申请号	USD3440351	申请日期	1966.09.09
申请人	BELL TELEPHONE LAB. INC.	发明人	HARRY J. BOLL
分类号	H03F1/30;(IPC1-7):H04M1/00	主分类号	H03F1/30
代理机构		代理人
主权项
地址

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