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经营范围
发明名称
Well pipe plug
摘要
申请公布号
GB473093(A)
申请公布日期
1937.10.06
申请号
GB19360018968
申请日期
1936.07.08
申请人
HYDRILL COMPANY
发明人
分类号
E21B33/03;E21B33/126
主分类号
E21B33/03
代理机构
代理人
主权项
地址
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