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发明名称
Improvements in or relating to measuring and indicating the speed of driving motors for deep boring machines
摘要
申请公布号
GB870076(A)
申请公布日期
1961.06.14
申请号
GB19570028470
申请日期
1957.09.10
申请人
SALZGITTER MASCHINEN AKTIENGESELLSCHAFT
发明人
分类号
E21B45/00
主分类号
E21B45/00
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