Borehole drilling apparatus for preventing lost circulation,申请号US19540453899-传众专利搜索

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发明名称	Borehole drilling apparatus for preventing lost circulation
摘要
申请公布号	US2849214(A)	申请公布日期	1958.08.26
申请号	US19540453899	申请日期	1954.09.02
申请人	GULF RESEARCH & DEVELOPMENT COMPANY	发明人	HALL JOHN I.
分类号	E21B10/60;E21B21/12	主分类号	E21B10/60
代理机构		代理人
主权项
地址

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