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发明名称
KONISK FRIKSJONSLAGERENHET.
摘要
申请公布号
NO873983(A)
申请公布日期
1987.09.23
申请号
NO19870003983
申请日期
1987.09.23
申请人
SMITH INTERNATIONAL INC
发明人
GECZY, BELA
分类号
E21B;F16C;(IPC1-7):E21B/;F16C/
主分类号
E21B
代理机构
代理人
主权项
地址
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