Oil saver and drilling control,申请号US19450631267-传众专利搜索

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发明名称	Oil saver and drilling control
摘要
申请公布号	US2502803(A)	申请公布日期	1950.04.04
申请号	US19450631267	申请日期	1945.11.28
申请人	SORENSEN LEE S	发明人	SORENSEN LEE S.
分类号	E21B33/06;E21B33/08	主分类号	E21B33/06
代理机构		代理人
主权项
地址

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