Hydraulic swivel for well drilling,申请号US19300466658-传众专利搜索

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发明名称	Hydraulic swivel for well drilling
摘要
申请公布号	US1956648(A)	申请公布日期	1934.05.01
申请号	US19300466658	申请日期	1930.07.09
申请人	WILLIAM MESSINGER	发明人	MESSINGER WILLIAM
分类号	E21B21/02;F16C19/54	主分类号	E21B21/02
代理机构		代理人
主权项
地址

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