Threaded drill rod element,申请号US19670633339-传众专利搜索

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发明名称	Threaded drill rod element
摘要
申请公布号	US3388935(A)	申请公布日期	1968.06.18
申请号	US19670633339	申请日期	1967.03.27
申请人	SANDVIKENS JERNVERKS AKTIEBOLAG	发明人	HJALSTEN JOHN ANDERS;GUSTAFSSON GUNNAR ARNE
分类号	B23B31/00;E21B17/042;F16B33/02	主分类号	B23B31/00
代理机构		代理人
主权项
地址

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