Railway-traffic-controlling apparatus,申请号US19230661672-传众专利搜索

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发明名称	Railway-traffic-controlling apparatus
摘要
申请公布号	US1789919(A)	申请公布日期	1931.01.20
申请号	US19230661672	申请日期	1923.09.08
申请人	THE UNION SWITCH & SIGNAL COMPANY	发明人	WALLACE HERBERT A.
分类号	B61L3/22	主分类号	B61L3/22
代理机构		代理人
主权项
地址

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