Racking mechanism for earth boring equipment,申请号US19600033158-传众专利搜索

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发明名称	Racking mechanism for earth boring equipment
摘要
申请公布号	US3177944(A)	申请公布日期	1965.04.13
申请号	US19600033158	申请日期	1960.06.01
申请人	DOWTY ROTOL LIMITED	发明人	KNIGHTS RICHARD N.
分类号	E21B19/15;E21B19/20	主分类号	E21B19/15
代理机构		代理人
主权项
地址

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