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发明名称
Mounting for discharge beans in well drilling bits
摘要
申请公布号
GB874160(A)
申请公布日期
1961.08.02
申请号
GB19600018662
申请日期
1960.05.26
申请人
SMITH TOOL CO.
发明人
SWART KENNETH HAYES
分类号
E21B10/18;E21B10/20
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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