Rotary drilling device,申请号US19870047420-传众专利搜索

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发明名称	Rotary drilling device
摘要
申请公布号	US4790397(A)	申请公布日期	1988.12.13
申请号	US19870047420	申请日期	1987.05.06
申请人	CLEDISC INTERNATIONAL BV	发明人	KAALSTAD, OSCAR;REID, NEIL G.
分类号	E21B10/12;E21B10/16;E21B10/20;E21B10/52;(IPC1-7):E21B10/08	主分类号	E21B10/12
代理机构		代理人
主权项
地址

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