Well-drilling roller bit,申请号US19550496963-传众专利搜索

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发明名称	Well-drilling roller bit
摘要
申请公布号	US2875984(A)	申请公布日期	1959.03.03
申请号	US19550496963	申请日期	1955.03.28
申请人	GLOBE OIL TOOLS	发明人	GOODWIN JOHN S.
分类号	E21B10/18	主分类号	E21B10/18
代理机构		代理人
主权项
地址

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