Improved pit prop,申请号GB19510019364-传众专利搜索

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发明名称	Improved pit prop
摘要
申请公布号	GB699838(A)	申请公布日期	1953.11.18
申请号	GB19510019364	申请日期	1951.08.16
申请人	ARNOLD HAARMANN	发明人
分类号	E21D15/42	主分类号	E21D15/42
代理机构		代理人
主权项
地址

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