Well drilling equipment for handling drill pipe and casing in high pressure wells,申请号US19310569648-传众专利搜索

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发明名称	Well drilling equipment for handling drill pipe and casing in high pressure wells
摘要
申请公布号	US1971473(A)	申请公布日期	1934.08.28
申请号	US19310569648	申请日期	1931.10.19
申请人	THE NATIONAL SUPERLOR COMPANY	发明人	ZERBE LEWIS EMANUEL;TIMBS EDWARD
分类号	E21B19/00;E21B33/072	主分类号	E21B19/00
代理机构		代理人
主权项
地址

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