Приспособление, предохраняющее от оставления на забое турбобура,申请号SU19490408612-传众专利搜索

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发明名称	Приспособление, предохраняющее от оставления на забое турбобура
摘要
申请公布号	SU87816(A1)	申请公布日期	1950.11.30
申请号	SU19490408612	申请日期	1949.12.12
申请人	OLOVYANOV M.D.;SHUMILOV S.P.	发明人	OLOVYANOV M.D.;SHUMILOV S.P.
分类号	E21B4/18;E21B23/01	主分类号	E21B4/18
代理机构		代理人
主权项
地址

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