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经营范围
发明名称
Casing plug
摘要
申请公布号
US1971514(A)
申请公布日期
1934.08.28
申请号
US19310548837
申请日期
1931.07.06
申请人
HYDRIL COMPANY
发明人
STONE FREDERICK
分类号
E21B33/129
主分类号
E21B33/129
代理机构
代理人
主权项
地址
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