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发明名称
Improvements in detachable bits and method of making the same
摘要
申请公布号
GB539245(A)
申请公布日期
1941.09.02
申请号
GB19400004233
申请日期
1940.03.06
申请人
DETACHABLE BIT COMPANY
发明人
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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