Signaling arrangement for two party telephone lines,申请号US19310547338-传众专利搜索

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发明名称	Signaling arrangement for two party telephone lines
摘要
申请公布号	US1860459(A)	申请公布日期	1932.05.31
申请号	US19310547338	申请日期	1931.06.27
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	EDWARDS WILLIAM HOPPLE
分类号	H04Q5/24	主分类号	H04Q5/24
代理机构		代理人
主权项
地址

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