EXPANSIBLE ROTARY DRILL BIT WITH HYDRAULIC LOCK,申请号GB19690038667-传众专利搜索

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发明名称	EXPANSIBLE ROTARY DRILL BIT WITH HYDRAULIC LOCK
摘要
申请公布号	GB1218915(A)	申请公布日期	1971.01.13
申请号	GB19690038667	申请日期	1969.08.01
申请人	ROTARY OIL TOOL COMPANY	发明人
分类号	E21B10/34	主分类号	E21B10/34
代理机构		代理人
主权项
地址

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