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发明名称
STOETDEMPER FOR BORESTRENG
摘要
申请公布号
NO850347(A)
申请公布日期
1980.01.02
申请号
NO19850000347
申请日期
1985.01.29
申请人
CHRISTENSEN, INC,
发明人
OSTERTAG, ALFRED,
分类号
E21B17/07;(IPC1-7):E21B/
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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