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经营范围
发明名称
Sealing and hanging assembly
摘要
申请公布号
US2690344(A)
申请公布日期
1954.09.28
申请号
US19500160780
申请日期
1950.05.08
申请人
CAMERON IRON WORKS, INC.
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
主权项
地址
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