Electrical system for secret transmission,申请号US19270226857-传众专利搜索

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发明名称	Electrical system for secret transmission
摘要
申请公布号	US1753353(A)	申请公布日期	1930.04.08
申请号	US19270226857	申请日期	1927.10.18
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	STEINBERG JOHN C.
分类号	H04K1/02	主分类号	H04K1/02
代理机构		代理人
主权项
地址

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