Telephone-ringing system,申请号US19290360476-传众专利搜索

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发明名称	Telephone-ringing system
摘要
申请公布号	US1778768(A)	申请公布日期	1930.10.21
申请号	US19290360476	申请日期	1929.05.04
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	NORTON PHILANDER
分类号	H04Q5/06	主分类号	H04Q5/06
代理机构		代理人
主权项
地址

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