METHOD FOR THE ESTABLISHMENT OF CONFERENCE TELEGRAPHY CONNECTIONS IN CENTRALLY CONTROLLED TELEGRAPHY DIAL EXCHANGE INSTALLATIONS,申请号USD3697672-传众专利搜索

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发明名称	METHOD FOR THE ESTABLISHMENT OF CONFERENCE TELEGRAPHY CONNECTIONS IN CENTRALLY CONTROLLED TELEGRAPHY DIAL EXCHANGE INSTALLATIONS
摘要
申请公布号	US3697672(A)	申请公布日期	1972.10.10
申请号	USD3697672	申请日期	1969.08.18
申请人	SIEMENS AG.	发明人	HANS REISCH
分类号	H04L12/18;H04L12/50;(IPC1-7):H04L11/00	主分类号	H04L12/18
代理机构		代理人
主权项
地址

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