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发明名称
RINGABDICHTUNG FUER EINEN BOHRLOCHKOPF.
摘要
申请公布号
DE3881757(D1)
申请公布日期
1993.07.22
申请号
DE19883881757
申请日期
1988.01.11
申请人
COOPER INDUSTRIES, INC., HOUSTON, TEX., US
发明人
SMITH, JERRY D., HOUSTON TEXAS 77065, US;SZYMCZAK, EDWARD J., SPRING TEXAS 77373, US
分类号
E21B33/03;E21B33/00;E21B33/04;(IPC1-7):E21B33/04;F16J15/02
主分类号
E21B33/03
代理机构
代理人
主权项
地址
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