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发明名称
Improvements in sleeve protectors for earth boring drills
摘要
申请公布号
GB529726(A)
申请公布日期
1940.11.27
申请号
GB19390014993
申请日期
1939.05.19
申请人
THE LEYLAND AND BIRMINGHAM RUBBER COMPANY LIMITED;HENRY JAMES BUTCHER;REGINALD WILLIAM LUNN
发明人
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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