Railway train-indicating apparatus,申请号US19290398300-传众专利搜索

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发明名称	Railway train-indicating apparatus
摘要
申请公布号	US1770897(A)	申请公布日期	1930.07.22
申请号	US19290398300	申请日期	1929.10.09
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	BROOKS CHARLES A.;RITTERBUSH LEONARD C.
分类号	B61L21/06	主分类号	B61L21/06
代理机构		代理人
主权项
地址

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