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经营范围
发明名称
Device for sealing wire lines, including a cable having spaced sealing members
摘要
申请公布号
US2639692(A)
申请公布日期
1953.05.26
申请号
US19490089351
申请日期
1949.04.23
申请人
M. O. JOHNSTON
发明人
AKERS EDWARD G.
分类号
E21B33/072
主分类号
E21B33/072
代理机构
代理人
主权项
地址
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