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发明名称
Detachable fastening for drill bits
摘要
申请公布号
US2111785(A)
申请公布日期
1938.03.22
申请号
US19360057651
申请日期
1936.01.06
申请人
HARDSOCG MANUFACTURING COMPANY
发明人
KITTRELL MILTON J.
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
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地址
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