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发明名称
Well capper
摘要
申请公布号
US1860711(A)
申请公布日期
1932.05.31
申请号
US19300430471
申请日期
1930.02.24
申请人
REX D. FRAZIER
发明人
GUEDRY HALE
分类号
E21B33/06
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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