Process and apparatus for cementing oil wells,申请号US19380246617-传众专利搜索

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发明名称	Process and apparatus for cementing oil wells
摘要
申请公布号	US2160228(A)	申请公布日期	1939.05.30
申请号	US19380246617	申请日期	1938.12.19
申请人	SHELL DEVELOPMENT COMPANY	发明人	PUSTMUELLER PAUL S.
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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