DEVICE FOR BACK-WASH DRILLING OF HOLES,申请号SU19914931842-传众专利搜索

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发明名称	DEVICE FOR BACK-WASH DRILLING OF HOLES
摘要
申请公布号	RU1799989(C)	申请公布日期	1993.03.07
申请号	SU19914931842	申请日期	1991.04.30
申请人	PK KONTORA PROEKTNO-STROITELNOGO OBEDINENIYA "VOSTOKBURVOD"	发明人	DEREVYANNYKH ARKADIJ I,SU;FETISOV SERGEJ YU,SU;ZHUKOV ALEKSANDR I,SU
分类号	E21B21/14	主分类号	E21B21/14
代理机构		代理人
主权项
地址

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