Well cementing apparatus,申请号US19390310811-传众专利搜索

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发明名称	Well cementing apparatus
摘要
申请公布号	US2251977(A)	申请公布日期	1941.08.12
申请号	US19390310811	申请日期	1939.12.23
申请人	BAKER OIL TOOLS, INC.	发明人	BURT CLARENCE E.
分类号	E21B33/14	主分类号	E21B33/14
代理机构		代理人
主权项
地址

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