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发明名称
PNEUMATISCHE SCHLAGVORRICHTUNG ZUM HERSTELLEN VON BOHRLOECHERN IM ERDREICH
摘要
申请公布号
DE2428788(B2)
申请公布日期
1977.05.18
申请号
DE19742428788
申请日期
1974.06.14
申请人
发明人
分类号
E21B4/14;E21B7/26;E21C37/24;E21D9/10;F01L21/02;F01L21/04;F01L23/00;F03C1/007;(IPC1-7):E02D17/146
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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