Conference call circuits,申请号US19640373772-传众专利搜索

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发明名称	Conference call circuits
摘要
申请公布号	US3364309(A)	申请公布日期	1968.01.16
申请号	US19640373772	申请日期	1964.06.09
申请人	INTERNATIONAL STANDARD ELECTRIC CORPORATION	发明人	HORNER ROLAND
分类号	H04M3/56	主分类号	H04M3/56
代理机构		代理人
主权项
地址

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