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发明名称
Improvements in or relating to rock drilling machines
摘要
申请公布号
GB572448(A)
申请公布日期
1945.10.09
申请号
GB19430017576
申请日期
1943.10.25
申请人
GUSTAV ALBERT BERGMAN
发明人
分类号
E21B1/34;E21B21/01
主分类号
E21B1/34
代理机构
代理人
主权项
地址
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