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发明名称
Gesteinsbohrer
摘要
申请公布号
DE512954(C)
申请公布日期
1930.11.20
申请号
DED512954D
申请日期
1930.04.03
申请人
HANS WALSER
发明人
分类号
E21B17/042
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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