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发明名称	ROLLER ROCK BIT
摘要
申请公布号	PL122483(B1)	申请公布日期	1982.07.31
申请号	PL19790215099	申请日期	1979.04.23
申请人		发明人
分类号	E21B10/16;E21B10/52;(IPC1-7):E21B10/08	主分类号	E21B10/16
代理机构		代理人
主权项
地址

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