METHOD AND APPARATUS FOR DRILLING HOLES IN UNSTABLE ROCK,申请号SU19853955879-传众专利搜索

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发明名称	METHOD AND APPARATUS FOR DRILLING HOLES IN UNSTABLE ROCK
摘要
申请公布号	SU1323693(A1)	申请公布日期	1987.07.15
申请号	SU19853955879	申请日期	1985.09.25
申请人	VNII ORG MEKH SHAKHT	发明人	GEJ BORIS A,SU
分类号	E21B21/00;E21B33/03	主分类号	E21B21/00
代理机构		代理人
主权项
地址

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