Reverse circulation pellet impact drilling and coring apparatus,申请号US19520268881-传众专利搜索

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发明名称	Reverse circulation pellet impact drilling and coring apparatus
摘要
申请公布号	US2717761(A)	申请公布日期	1955.09.13
申请号	US19520268881	申请日期	1952.01.29
申请人	ESSO RESEARCH AND ENGINEERING COMPANY	发明人	JR. LEROY W. LEDGERWOOD,
分类号	E21B7/16	主分类号	E21B7/16
代理机构		代理人
主权项
地址

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