DEVICE FOR DRILLING FROZEN ROCK,申请号SU19772438764-传众专利搜索

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发明名称	DEVICE FOR DRILLING FROZEN ROCK
摘要
申请公布号	SU637529(A2)	申请公布日期	1978.12.15
申请号	SU19772438764	申请日期	1977.01.03
申请人	KOROTKOV VALENTIN P,SU	发明人	KOROTKOV VALENTIN P,SU
分类号	E21B7/30;E02F5/30;E21C37/18;(IPC1-7):E21C37/18;E21C1/14	主分类号	E21B7/30
代理机构		代理人
主权项
地址

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