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发明名称
Well point
摘要
申请公布号
US2149874(A)
申请公布日期
1939.03.07
申请号
US19370166083
申请日期
1937.09.28
申请人
STANG JOHN W
发明人
STANG JOHN W.
分类号
E21B7/18;E21B7/20;E21B43/08
主分类号
E21B7/18
代理机构
代理人
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地址
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