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发明名称
Verfahren und Vorrichtung zum Nassbohren von Loechern in Mineralien mittels eines Drehbohr-Hohlgestaenges
摘要
申请公布号
DE1238417(B)
申请公布日期
1967.04.13
申请号
DE196300SC419
申请日期
1963.06.18
申请人
SCHMIDT, KRANZ & CO. G.M.B.H.;ZWEIGNIEDERLASSUNG MASCHINENBAU
发明人
HOFFMANN DIPL.-ING. ERNST
分类号
E21B17/046;E21B17/22
主分类号
E21B17/046
代理机构
代理人
主权项
地址
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