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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
GB444680(A)
申请公布日期
1936.03.25
申请号
GB19350031829
申请日期
1935.11.16
申请人
INGERSOLL-RAND COMPANY
发明人
分类号
E21B6/06
主分类号
E21B6/06
代理机构
代理人
主权项
地址
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