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发明名称
Vorrichtung zum Erzeugen eines Umlaufs von Bohrfluessigkeit bei Drehbohrern
摘要
申请公布号
DE967923(C)
申请公布日期
1957.12.27
申请号
DE1954F014688
申请日期
1954.05.12
申请人
GEORGE E. FAILING COMPANY
发明人
MICKLE VIRGIL CHARLES
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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