Supervisory signaling system for toll telephone service timing,申请号US19280325185-传众专利搜索

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发明名称	Supervisory signaling system for toll telephone service timing
摘要
申请公布号	US1849468(A)	申请公布日期	1932.03.15
申请号	US19280325185	申请日期	1928.12.11
申请人	HEIKICHI ONISHI	发明人	ONISHI HEIKICHI
分类号	H04M3/12	主分类号	H04M3/12
代理机构		代理人
主权项
地址

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