Drill pipe float,申请号US19320618689-传众专利搜索

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发明名称	Drill pipe float
摘要
申请公布号	US1984107(A)	申请公布日期	1934.12.11
申请号	US19320618689	申请日期	1932.06.22
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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