System of train control,申请号US19230661853-传众专利搜索

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发明名称	System of train control
摘要
申请公布号	US1767557(A)	申请公布日期	1930.06.24
申请号	US19230661853	申请日期	1923.09.10
申请人	SIMMEN PAUL J	发明人	SIMMEN PAUL J.
分类号	B61L25/06	主分类号	B61L25/06
代理机构		代理人
主权项
地址

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