A core recovering device for use in diamond and rotary drilling,申请号GB19450005207-传众专利搜索

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发明名称	A core recovering device for use in diamond and rotary drilling
摘要
申请公布号	GB611036(A)	申请公布日期	1948.10.25
申请号	GB19450005207	申请日期	1945.03.02
申请人	CHARLES FRANCIS DUFFIELD	发明人
分类号	E21B25/12	主分类号	E21B25/12
代理机构		代理人
主权项
地址

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