Drill stem packer with deflating means,申请号US19500198337-传众专利搜索

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发明名称	Drill stem packer with deflating means
摘要
申请公布号	US2637401(A)	申请公布日期	1953.05.05
申请号	US19500198337	申请日期	1950.11.30
申请人	STANDARD OIL DEVELOPMENT COMPANY	发明人	RAMSEY GEORGE H.
分类号	E21B33/127	主分类号	E21B33/127
代理机构		代理人
主权项
地址

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