Signaling system for railroads,申请号US19390253837-传众专利搜索

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发明名称	Signaling system for railroads
摘要
申请公布号	US2293139(A)	申请公布日期	1942.08.18
申请号	US19390253837	申请日期	1939.01.31
申请人	ALICE MAIJGREN HOPPE;GENERAL RAILWAY SIGNAL COMPANY	发明人
分类号	B61L1/18;B61L3/22	主分类号	B61L1/18
代理机构		代理人
主权项
地址

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