Sand and gas excluder means for wells,申请号US19400316672-传众专利搜索

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发明名称	Sand and gas excluder means for wells
摘要
申请公布号	US2290127(A)	申请公布日期	1942.07.14
申请号	US19400316672	申请日期	1940.01.31
申请人	JOHNSON JULIUS W	发明人	JOHNSON JULIUS W.
分类号	E21B43/38	主分类号	E21B43/38
代理机构		代理人
主权项
地址

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