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发明名称
ROUND TRIP DEVICE FOR WELLS UNDER PRESSURE
摘要
申请公布号
SU1721212(A1)
申请公布日期
1992.03.23
申请号
SU19874281347
申请日期
1987.07.09
申请人
AZERB NI PK I NEFTYANOGO MASHINOSTROENIYA
发明人
KRUTKIN ALFRED V,SU
分类号
E21B19/00;E21B19/24
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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