Electronic ringing apparatus,申请号US19550517527-传众专利搜索

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法人/股东/高管

发明名称	Electronic ringing apparatus
摘要
申请公布号	US2832838(A)	申请公布日期	1958.04.29
申请号	US19550517527	申请日期	1955.06.23
申请人	GENERAL DYNAMICS CORPORATION	发明人	TROUSDALE ROBERT B.
分类号	H04Q11/04	主分类号	H04Q11/04
代理机构		代理人
主权项
地址

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