Electric signaling system,申请号US19270219907-传众专利搜索

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发明名称	Electric signaling system
摘要
申请公布号	US1753329(A)	申请公布日期	1930.04.08
申请号	US19270219907	申请日期	1927.09.16
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	BLACK HAROLD S.
分类号	H04J1/14;H04Q1/446	主分类号	H04J1/14
代理机构		代理人
主权项
地址

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