Block signal system,申请号US19290411966-传众专利搜索

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发明名称	Block signal system
摘要
申请公布号	US2030675(A)	申请公布日期	1936.02.11
申请号	US19290411966	申请日期	1929.12.05
申请人	GENERAL ELECTRIC COMPANY	发明人	ARKENBURGH WEBER H.
分类号	B61L23/16	主分类号	B61L23/16
代理机构		代理人
主权项
地址

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