Drill collar float valve for well drilling strings,申请号US19360105039-传众专利搜索

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发明名称	Drill collar float valve for well drilling strings
摘要
申请公布号	US2117533(A)	申请公布日期	1938.05.17
申请号	US19360105039	申请日期	1936.10.10
申请人	BAKER OIL TOOLS, INC.	发明人	BAKER REUBEN C.
分类号	E21B21/10	主分类号	E21B21/10
代理机构		代理人
主权项
地址

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