VARIABLE GAIN CIRCUIT FOR LOUDSPEAKER TELEPHONE SET,申请号JP19870169272-传众专利搜索

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发明名称	VARIABLE GAIN CIRCUIT FOR LOUDSPEAKER TELEPHONE SET
摘要
申请公布号	JPS6412649(A)	申请公布日期	1989.01.17
申请号	JP19870169272	申请日期	1987.07.06
申请人	NEC CORP	发明人	SHIMADA KEIKO
分类号	H04M1/60;H04M9/08	主分类号	H04M1/60
代理机构		代理人
主权项
地址

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