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发明名称
SENKEBORESYSTEM.
摘要
申请公布号
NO800285(A)
申请公布日期
1980.08.06
申请号
NO19800000285
申请日期
1980.02.04
申请人
TULLOS, HOMAN C.,;WOODS, DEWEY WAYNE,
发明人
TULLOS, HOMAN C.,;WOODS, DEWEY WAYNE,
分类号
E21B3/04;E21B4/20;E21B19/22;(IPC1-7):E21B/
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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