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发明名称
INNRETNING FOR SIGNALERING I ET BOREHULL UNDER BORING
摘要
申请公布号
NO844639(A)
申请公布日期
1985.05.23
申请号
NO19840004639
申请日期
1984.11.21
申请人
SPERRY-SUN, INC., NL,
发明人
RUSSELL, ANTHONY WILLIAM,;RUSSELL, MICHAEL KING,;ENGLAND.
分类号
E21B21/08;E21B47/18;(IPC1-7):E21B/;G08C/
主分类号
E21B21/08
代理机构
代理人
主权项
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