Three-cone bit,申请号US19330666472-传众专利搜索

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发明名称	Three-cone bit
摘要
申请公布号	US1983316(A)	申请公布日期	1934.12.04
申请号	US19330666472	申请日期	1933.04.17
申请人	HUGHES TOOL COMPANY	发明人	SCOTT FLOYD L.;GARFIELD LEWIS E.
分类号	E21B10/16	主分类号	E21B10/16
代理机构		代理人
主权项
地址

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