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发明名称
APPARAT TIL AVFOELING AV SKJOETER PAA BOREROER.
摘要
申请公布号
NO810992(A)
申请公布日期
1982.09.27
申请号
NO19810000992
申请日期
1981.03.24
申请人
BJ-HUGHES INC,
发明人
SHELDON, LOREN B.,
分类号
E21B;(IPC1-7):E21B/
主分类号
E21B
代理机构
代理人
主权项
地址
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