Well cementng apparatus,申请号US19390306225-传众专利搜索

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发明名称	Well cementng apparatus
摘要
申请公布号	US2212087(A)	申请公布日期	1940.08.20
申请号	US19390306225	申请日期	1939.11.27
申请人	THORNHILL CHARLES W	发明人	THORNHILL CHARLES W.
分类号	E21B17/14;E21B21/10;E21B33/14	主分类号	E21B17/14
代理机构		代理人
主权项
地址

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