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发明名称
OVERBRENGINRICHTING VOOR BOORPIJPTREKKEN EN ZWAARSTANG- TREKKEN.
摘要
申请公布号
NL159753(B)
申请公布日期
1979.03.15
申请号
NL19690007814
申请日期
1969.05.21
申请人
BYRON JACKSON, INC., LONG BEACH, CALIFORNIE, VER.ST.V.AM.
发明人
分类号
E21B19/14;(IPC1-7):E21B19/14
主分类号
E21B19/14
代理机构
代理人
主权项
地址
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