Improvements in devices for pulling down pit props,申请号GB19370035535-传众专利搜索

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发明名称	Improvements in devices for pulling down pit props
摘要
申请公布号	GB507921(A)	申请公布日期	1939.06.22
申请号	GB19370035535	申请日期	1937.12.22
申请人	FRIEDRICH WILHELM MOLL	发明人
分类号	E21D15/60	主分类号	E21D15/60
代理机构		代理人
主权项
地址

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