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发明名称
WELL FLOW CONTROL APPARATUS
摘要
申请公布号
US3474859(A)
申请公布日期
1969.10.28
申请号
USD3474859
申请日期
1967.07.14
申请人
BAKER OIL TOOLS INC.
发明人
DAVID V. CHENOWETH
分类号
E21B34/08;E21B43/12;E21B43/14;(IPC1-7):E21B33/12
主分类号
E21B34/08
代理机构
代理人
主权项
地址
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