Railroad safety device,申请号US19390307127-传众专利搜索

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发明名称	Railroad safety device
摘要
申请公布号	US2254607(A)	申请公布日期	1941.09.02
申请号	US19390307127	申请日期	1939.12.01
申请人	DIEGO GUERRERO	发明人	GUERRERO DIEGO
分类号	B61F9/00	主分类号	B61F9/00
代理机构		代理人
主权项
地址

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