Improvements relating to crossings and frogs for overhead electric traction systems,申请号GB19380020999-传众专利搜索

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发明名称	Improvements relating to crossings and frogs for overhead electric traction systems
摘要
申请公布号	GB516323(A)	申请公布日期	1939.12.29
申请号	GB19380020999	申请日期	1938.07.15
申请人	NATHANIEL HERBERT THOMAS;LONDON PASSENGER TRANSPORT BOARD	发明人
分类号	B60M1/14	主分类号	B60M1/14
代理机构		代理人
主权项
地址

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