Secret signaling system,申请号US19440523795-传众专利搜索

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发明名称	Secret signaling system
摘要
申请公布号	US2401494(A)	申请公布日期	1946.06.04
申请号	US19440523795	申请日期	1944.02.25
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	MARTIN WADE B.
分类号	H04L9/38	主分类号	H04L9/38
代理机构		代理人
主权项
地址

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