Hydraulic jib arm for drilling machines,申请号US19520272151-传众专利搜索

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发明名称	Hydraulic jib arm for drilling machines
摘要
申请公布号	US2750155(A)	申请公布日期	1956.06.12
申请号	US19520272151	申请日期	1952.02.18
申请人	ROGERS IRON WORKS COMPANY	发明人	NIXON VIRGIL H.
分类号	E21B15/04	主分类号	E21B15/04
代理机构		代理人
主权项
地址

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