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发明名称
Bottom hole choke
摘要
申请公布号
US2428139(A)
申请公布日期
1947.09.30
申请号
US19440544202
申请日期
1944.07.10
申请人
BRIDWELL FRANK F;PAULINE MORRISON CLARA
发明人
BRIDWELL FRANK F.;MORRISON CLARA PAULINE
分类号
E21B23/02;E21B34/08
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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