Automatic railroad crossing signal,申请号US19310581833-传众专利搜索

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发明名称	Automatic railroad crossing signal
摘要
申请公布号	US1891739(A)	申请公布日期	1932.12.20
申请号	US19310581833	申请日期	1931.12.18
申请人	SAMUEL WENGER	发明人	WENGER SAMUEL
分类号	B61L29/22	主分类号	B61L29/22
代理机构		代理人
主权项
地址

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