Tubing control head,申请号US19350056636-传众专利搜索

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发明名称	Tubing control head
摘要
申请公布号	US2163422(A)	申请公布日期	1939.06.20
申请号	US19350056636	申请日期	1935.12.30
申请人	WILLIAM L. PEARCE	发明人	CHURCH WALTER L.
分类号	E21B33/04	主分类号	E21B33/04
代理机构		代理人
主权项
地址

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