Kelly drive bushing,申请号US19570656432-传众专利搜索

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发明名称	Kelly drive bushing
摘要
申请公布号	US2970458(A)	申请公布日期	1961.02.07
申请号	US19570656432	申请日期	1957.05.01
申请人	DRESSER INDUSTRIES, INC.	发明人	MCLERRAN ARCHIE R.
分类号	E21B3/04	主分类号	E21B3/04
代理机构		代理人
主权项
地址

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