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发明名称
AN OPENING DEVICE FOR DRILL RODS FOR AN EXTENSION ROD DRILLING EQUIPMENT
摘要
申请公布号
GB2181682(B)
申请公布日期
1989.01.25
申请号
GB19860023172
申请日期
1986.09.26
申请人
OY * TAMPELLA AB
发明人
JARMO * LEPPANEN
分类号
E21B19/16;(IPC1-7):E21B19/16
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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