Method and apparatus for detecting oil in well drilling,申请号US19390282473-传众专利搜索

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发明名称	Method and apparatus for detecting oil in well drilling
摘要
申请公布号	US2213138(A)	申请公布日期	1940.08.27
申请号	US19390282473	申请日期	1939.07.01
申请人	HAYWARD JOHN T	发明人	HAYWARD JOHN T.
分类号	E21B49/00;G01N21/64	主分类号	E21B49/00
代理机构		代理人
主权项
地址

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