Rotating control head,申请号US19600066304-传众专利搜索

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发明名称	Rotating control head
摘要
申请公布号	US3173502(A)	申请公布日期	1965.03.16
申请号	US19600066304	申请日期	1960.10.31
申请人	OVERBY TERRY A	发明人	OVERBY TERRY A.
分类号	E21B21/00;E21B21/015	主分类号	E21B21/00
代理机构		代理人
主权项
地址

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