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发明名称
BORETAARN.
摘要
申请公布号
NO873673(A)
申请公布日期
1988.03.04
申请号
NO19870003673
申请日期
1987.09.01
申请人
DEUTAG DEUTSCHE TIEFBOHR-AG;PREUSSAG AG;SIEMENS AG;WINTERSHALL AG
发明人
VOIGTS, ECKHARD;ACHILLES, HANS HERBERT;HAUSSLER, ADOLF;PESCHEL, EBERHARD
分类号
E21B15/00;E21B19/14;(IPC1-7):E21B/
主分类号
E21B15/00
代理机构
代理人
主权项
地址
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