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经营范围
发明名称
Earth boring apparatus
摘要
申请公布号
US1844778(A)
申请公布日期
1932.02.09
申请号
US19300424576
申请日期
1930.01.30
申请人
ARMAND MEUNIER
发明人
MEUNIER ARMAND
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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