Hydraulic drilling jack,申请号US19370127054-传众专利搜索

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发明名称	Hydraulic drilling jack
摘要
申请公布号	US2179557(A)	申请公布日期	1939.11.14
申请号	US19370127054	申请日期	1937.02.23
申请人	CONLEY MASON JOHN	发明人	MASON JOHN CONLEY
分类号	E21B19/00	主分类号	E21B19/00
代理机构		代理人
主权项
地址

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