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发明名称
Mud throttling valve
摘要
申请公布号
US3342216(A)
申请公布日期
1967.09.19
申请号
US19660524061
申请日期
1966.02.01
申请人
BASS BROTHERS ENTERPRISES, INC.
发明人
III PHIL H. GRIFFIN
分类号
E21B21/10
主分类号
E21B21/10
代理机构
代理人
主权项
地址
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