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经营范围
发明名称
Improvements in rock drills
摘要
申请公布号
GB338792(A)
申请公布日期
1930.11.27
申请号
GB19300000874
申请日期
1930.01.09
申请人
HENRY SAMUEL POTTER
发明人
分类号
B25D17/26
主分类号
B25D17/26
代理机构
代理人
主权项
地址
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