Well drill pipe-handling apparatus,申请号US19540464471-传众专利搜索

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发明名称	Well drill pipe-handling apparatus
摘要
申请公布号	US2972388(A)	申请公布日期	1961.02.21
申请号	US19540464471	申请日期	1954.10.25
申请人	BUCYRUS-ERIE COMPANY	发明人	THORNBURG HERBERT W.
分类号	E21B19/14;E21B19/20	主分类号	E21B19/14
代理机构		代理人
主权项
地址

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