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发明名称
GRAAFTAND VAN EEN GRAAFEMMER.
摘要
申请公布号
NL178343(B)
申请公布日期
1985.10.01
申请号
NL19810001457
申请日期
1981.03.24
申请人
ESCO CORPORATION TE PORTLAND, OREGON, VER. ST. V. AM.
发明人
分类号
E21B10/04;E02F9/28;(IPC1-7):E02F3/60
主分类号
E21B10/04
代理机构
代理人
主权项
地址
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