Improvements in pit props,申请号GB19340004603-传众专利搜索

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发明名称	Improvements in pit props
摘要
申请公布号	GB433220(A)	申请公布日期	1935.08.12
申请号	GB19340004603	申请日期	1934.02.12
申请人	HUGO SCHRAMM	发明人
分类号	E21D15/44	主分类号	E21D15/44
代理机构		代理人
主权项
地址

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