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发明名称
Cross t
摘要
申请公布号
US1911819(A)
申请公布日期
1933.05.30
申请号
US19300435442
申请日期
1930.03.13
申请人
STANDARD OIL DEVELOPMENT COMPANY
发明人
EVANS SILAS E.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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