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发明名称
DICHTUNG FUER EINEN DREHSTEINMEISSEL
摘要
申请公布号
DE2608205(A1)
申请公布日期
1976.09.09
申请号
DE19762608205
申请日期
1976.02.25
申请人
DRESSER INDUSTRIES,INC.
发明人
LEE PENNY,SAMUEL
分类号
E21B10/18;E21B10/22;E21B10/24;E21B10/25;F16C21/00;F16J15/32;(IPC1-7):21B9/08
主分类号
E21B10/18
代理机构
代理人
主权项
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