Устройство для осушения плывунов при проходке вертикальных стволов шахт,申请号SU19470372179-传众专利搜索

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发明名称	Устройство для осушения плывунов при проходке вертикальных стволов шахт
摘要
申请公布号	SU80563(A1)	申请公布日期	1948.11.30
申请号	SU19470372179	申请日期	1947.12.23
申请人	ZHDANOV V.I.	发明人	ZHDANOV V.I.
分类号	E21D1/00;E21F17/00	主分类号	E21D1/00
代理机构		代理人
主权项
地址

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