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发明名称
VORRICHTUNG FUER DIE GESTEUERTE DAEMPFUNG VON AXIAL- UND TORSIONSKRAEFTEN IN EINEM BOHRLOCHGESTAENGE
摘要
申请公布号
DE3924195(A1)
申请公布日期
1990.01.25
申请号
DE19893924195
申请日期
1989.07.22
申请人
DRILEX SYSTEMS, INC., HOUSTON, TEX., US
发明人
FORREST, JOHN, HOUSTON, TEX., US
分类号
E21B17/07;E21B44/00
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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