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发明名称
Wellhead
摘要
申请公布号
US2517821(A)
申请公布日期
1950.08.08
申请号
US19430511255
申请日期
1943.11.22
申请人
CAMERON IRON WORKS
发明人
ALLEN HERBERT
分类号
E21B33/00;E21B33/04
主分类号
E21B33/00
代理机构
代理人
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