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经营范围
发明名称
Well cementing device
摘要
申请公布号
US2100586(A)
申请公布日期
1937.11.30
申请号
US19360098963
申请日期
1936.09.01
申请人
UNITED PIPE & SUPPLY CORPORATION
发明人
CAMPBELL HARRY G.
分类号
E21B33/138
主分类号
E21B33/138
代理机构
代理人
主权项
地址
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