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经营范围
发明名称
Valved well packer
摘要
申请公布号
US2339319(A)
申请公布日期
1944.01.18
申请号
US19410382079
申请日期
1941.03.06
申请人
BRIGHTWELL WALTER J
发明人
BRIGHTWELL WALTER J.
分类号
E21B33/128;E21B43/12
主分类号
E21B33/128
代理机构
代理人
主权项
地址
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