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发明名称
Gesteinsbohrhammer
摘要
申请公布号
DE570154(C)
申请公布日期
1933.02.11
申请号
DE1931B150234D
申请日期
1931.05.28
申请人
GUNNAR BERGSTROM
发明人
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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