DOUBLE DRILLING COLUMN,申请号SU19884405302-传众专利搜索

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发明名称	DOUBLE DRILLING COLUMN
摘要
申请公布号	SU1573135(A1)	申请公布日期	1990.06.23
申请号	SU19884405302	申请日期	1988.04.07
申请人	SREDNEAZIATSKIJ NII GEOLOGII MINERALNOGO SYRYA	发明人	USTYUGOV EGOR V,SU;TSOJ EDUARD,SU
分类号	E21B17/18	主分类号	E21B17/18
代理机构		代理人
主权项
地址

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