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经营范围
发明名称
UTBLAASNINGS-FORHINDRER.
摘要
申请公布号
NO811789(A)
申请公布日期
1981.12.07
申请号
NO19810001789
申请日期
1981.05.27
申请人
NL INDUSTRIES, INC.,
发明人
SCHAEPER, GARY R.,;OLSON, RICHARD A.,
分类号
E21B33/06;E21B33/064;(IPC1-7):E21B/
主分类号
E21B33/06
代理机构
代理人
主权项
地址
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