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经营范围
发明名称
Excavating method and apparatus
摘要
申请公布号
GB339656(A)
申请公布日期
1930.12.11
申请号
GB19290017857
申请日期
1929.06.11
申请人
OLIVER OSCAR APP
发明人
分类号
E21D9/10
主分类号
E21D9/10
代理机构
代理人
主权项
地址
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