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经营范围
发明名称
Packer assembly
摘要
申请公布号
US2352423(A)
申请公布日期
1944.06.27
申请号
US19400368127
申请日期
1940.12.02
申请人
CECIL WARE
发明人
CHURCH WALTER L.
分类号
E21B33/126
主分类号
E21B33/126
代理机构
代理人
主权项
地址
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