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发明名称
Well cap
摘要
申请公布号
US2220431(A)
申请公布日期
1940.11.05
申请号
US19390258782
申请日期
1939.02.27
申请人
STREHS ADAM J
发明人
STREHS ADAM J.
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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