Electric call and alarm system,申请号US19300420471-传众专利搜索

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发明名称	Electric call and alarm system
摘要
申请公布号	US2010233(A)	申请公布日期	1935.08.06
申请号	US19300420471	申请日期	1930.01.13
申请人	AMERICAN DISTRICT TELEGRAPH COMPANY	发明人	HOPKINS RICHARD M.;FARMER PAUL M.
分类号	H04M11/04	主分类号	H04M11/04
代理机构		代理人
主权项
地址

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