Drill bit construction having means for preventing mud-cutting,申请号US19570651309-传众专利搜索

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发明名称	Drill bit construction having means for preventing mud-cutting
摘要
申请公布号	US2960313(A)	申请公布日期	1960.11.15
申请号	US19570651309	申请日期	1957.04.08
申请人	GLOBE OIL TOOLS COMPANY	发明人	GOODWIN JOHN S.
分类号	E21B10/08;E21B10/18	主分类号	E21B10/08
代理机构		代理人
主权项
地址

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