Radio signaling system,申请号US19300490129-传众专利搜索

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发明名称	Radio signaling system
摘要
申请公布号	US2024138(A)	申请公布日期	1935.12.17
申请号	US19300490129	申请日期	1930.10.21
申请人	ARMSTRONG EDWIN H	发明人	ARMSTRONG EDWIN H.
分类号	H04B1/56	主分类号	H04B1/56
代理机构		代理人
主权项
地址

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