Threaded oil well drill stem connection with the threads having included crest angleof 90 degrees,申请号US19480027247-传众专利搜索

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发明名称	Threaded oil well drill stem connection with the threads having included crest angleof 90 degrees
摘要
申请公布号	US2772899(A)	申请公布日期	1956.12.04
申请号	US19480027247	申请日期	1948.05.15
申请人	HUGHES TOOL COMPANY	发明人	EVANS SETH
分类号	E21B17/042;E21B17/16;F16B7/18;F16B33/02;F16L15/06	主分类号	E21B17/042
代理机构		代理人
主权项
地址

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