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经营范围
发明名称
Well tubing
摘要
申请公布号
US2445249(A)
申请公布日期
1948.07.13
申请号
US19460653595
申请日期
1946.03.11
申请人
SPROULL EDITH M
发明人
SPROULL EDITH M.
分类号
E21B17/18
主分类号
E21B17/18
代理机构
代理人
主权项
地址
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