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发明名称
O-ring seal for rock bit bearings
摘要
申请公布号
GB9504943(D0)
申请公布日期
1995.04.26
申请号
GB19950004943
申请日期
1995.03.10
申请人
SMITH INTERNATIONAL INC
发明人
分类号
E21B10/22;E21B10/25
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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