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经营范围
发明名称
Improvements in or relating to rock drills
摘要
申请公布号
GB739177(A)
申请公布日期
1955.10.26
申请号
GB19530001215
申请日期
1953.01.15
申请人
JOSEPH DIONISOTTI
发明人
分类号
E21B21/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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