TELEPHONE RINGING APPARATUS,申请号CAD446505-传众专利搜索

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发明名称	TELEPHONE RINGING APPARATUS
摘要
申请公布号	CA446505(A)	申请公布日期	1948.02.03
申请号	CAD446505	申请日期
申请人	AUTOMATIC ELECTRIC LABORATORIES	发明人	ROSWELL H. HERRICK
分类号		主分类号
代理机构		代理人
主权项
地址

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