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发明名称
摘要
申请公布号	JPS6156385(B2)	申请公布日期	1986.12.02
申请号	JP19820209208	申请日期	1982.11.29
申请人	HUGHES TOOL CO	发明人	KERII ESU KENINTON;RONARUDO BEIKAA
分类号	E21B3/04;E21B19/08;E21B19/16	主分类号	E21B3/04
代理机构		代理人
主权项
地址

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