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发明名称
Collapsible hole straightener
摘要
申请公布号
US1864274(A)
申请公布日期
1932.06.21
申请号
US19300422578
申请日期
1930.01.22
申请人
JOHN GRANT
发明人
SANTIAGO JAMES J.
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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