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经营范围
发明名称
ANORDNING FOR AVTETNING AV BROENNHODER
摘要
申请公布号
NO781445(A)
申请公布日期
1978.10.27
申请号
NO19780001445
申请日期
1978.04.25
申请人
NL INDUSTRIES, INC.,
发明人
PIERCE, ELWOOD K., JR.,
分类号
F16J15/06;E21B33/00;E21B33/04;F16J15/16;(IPC1-7):E21B/
主分类号
F16J15/06
代理机构
代理人
主权项
地址
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