A new or improved chock release for supports for mine roofs,申请号GB19540023050-传众专利搜索

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发明名称	A new or improved chock release for supports for mine roofs
摘要
申请公布号	GB768719(A)	申请公布日期	1957.02.20
申请号	GB19540023050	申请日期	1954.08.09
申请人	THE MINING ENGINEERING COMPANY LIMITED	发明人	DUNCAN ANGUS WELLESLEY
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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