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发明名称
Valve for reverse circulation drilling system
摘要
申请公布号
AU1788595(A)
申请公布日期
1996.11.21
申请号
AU19950017885
申请日期
1995.05.04
申请人
STEVEN VORBURGER
发明人
STEVEN VORBURGER
分类号
E21B21/10;F16K3/26;F16K11/07;F16K29/00
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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