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经营范围
发明名称
Bottom well choke
摘要
申请公布号
US1996922(A)
申请公布日期
1935.04.09
申请号
US19300504721
申请日期
1930.12.26
申请人
J. H. MCEVOY & COMPANY
发明人
HOWARD JAMES H.
分类号
E21B34/08
主分类号
E21B34/08
代理机构
代理人
主权项
地址
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