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发明名称
Collapsible drill bit
摘要
申请公布号
US3306377(A)
申请公布日期
1967.02.28
申请号
US19630332797
申请日期
1963.12.23
申请人
JOHNSON HOWARD L
发明人
JOHNSON HOWARD L.
分类号
E21B10/66
主分类号
E21B10/66
代理机构
代理人
主权项
地址
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