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经营范围
发明名称
Well closing apparatus
摘要
申请公布号
US1874889(A)
申请公布日期
1932.08.30
申请号
US19310577338
申请日期
1931.11.25
申请人
C. L. HILL, JR.
发明人
BURRIS RICHARD M.
分类号
E21B35/00
主分类号
E21B35/00
代理机构
代理人
主权项
地址
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