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发明名称
PERCUSSION DRILL AND METHOD OF CONTROLLING SUCH A DRILL
摘要
申请公布号
GB2213179(A)
申请公布日期
1989.08.09
申请号
GB19880029656
申请日期
1988.12.20
申请人
* TERRA AG FUER TIEFBAUTECHNIK
发明人
GUSTAV * JENNE;DIETMAR * JENNE
分类号
E21B7/26;E21B4/14
主分类号
E21B7/26
代理机构
代理人
主权项
地址
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