ARRANGEMENT FOR AUTOMATICALLY CONTROLLING THE SOUND LEVEL OF A TELEPHONE INSTRUMENT,申请号GB19810009386-传众专利搜索

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发明名称	ARRANGEMENT FOR AUTOMATICALLY CONTROLLING THE SOUND LEVEL OF A TELEPHONE INSTRUMENT
摘要
申请公布号	GB2073518(B)	申请公布日期	1984.03.28
申请号	GB19810009386	申请日期	1981.03.25
申请人	TRT TELECOM RADIO ELECTR	发明人
分类号	H03G3/20;H03K7/08;H04M1/60;(IPC1-7):H03G3/20	主分类号	H03G3/20
代理机构		代理人
主权项
地址

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