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发明名称
Core engaging device
摘要
申请公布号
US1807953(A)
申请公布日期
1931.06.02
申请号
US19290371348
申请日期
1929.06.17
申请人
ANDERSON REXFORD O
发明人
ANDERSON REXFORD O.
分类号
E21B25/14
主分类号
E21B25/14
代理机构
代理人
主权项
地址
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