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发明名称
Well swar
摘要
申请公布号
US2544984(A)
申请公布日期
1951.03.13
申请号
US19490132525
申请日期
1949.12.12
申请人
DONZIS JEROME M
发明人
DONZIS JEROME M.
分类号
E21B37/10
主分类号
E21B37/10
代理机构
代理人
主权项
地址
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