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发明名称
Régulateur automatique de la pression de forage pour perforatrices de roches
摘要
申请公布号
FR67353(E)
申请公布日期
1958.03.06
申请号
FRD67353
申请日期
1954.10.26
申请人
SALZGITTER MASCHINEN AKTIENGESELLSCHAFT
发明人
分类号
E21B19/084;E21B44/02
主分类号
E21B19/084
代理机构
代理人
主权项
地址
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