Telephone alarm system,申请号US19460660618-传众专利搜索

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发明名称	Telephone alarm system
摘要
申请公布号	US2461241(A)	申请公布日期	1949.02.08
申请号	US19460660618	申请日期	1946.04.09
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	SHANN OSCAR A.
分类号	H04M11/04;H04M19/04	主分类号	H04M11/04
代理机构		代理人
主权项
地址

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