STEPPED-DIAMETER EARTH-DRILLING TOOL,申请号SU19843745276-传众专利搜索

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发明名称	STEPPED-DIAMETER EARTH-DRILLING TOOL
摘要
申请公布号	SU1590535(A1)	申请公布日期	1990.09.07
申请号	SU19843745276	申请日期	1984.05.29
申请人	VNII BUROVOJ TEKHNIKI	发明人	FRYZ IVAN M,SU;POTASHNIKOV VLADIMIR D,SU;RAJKHERT LYUDVIG A,SU;BOZYREV YURIJ S,SU
分类号	E21B7/08	主分类号	E21B7/08
代理机构		代理人
主权项
地址

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