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发明名称
PRUEFWERKZEUG FUER BOHRLOECHER
摘要
申请公布号
AT354959(B)
申请公布日期
1980.02.11
申请号
AT19770004793
申请日期
1977.07.05
申请人
BJ-HUGHES INC.
发明人
分类号
E21B49/00;E21B33/12;E21B49/08;(IPC1-7):E21B49/02
主分类号
E21B49/00
代理机构
代理人
主权项
地址
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