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发明名称
Schwerstange zum Kernbohren
摘要
申请公布号
DE1458632(B1)
申请公布日期
1971.03.11
申请号
DE196500W0184
申请日期
1965.10.27
申请人
WALKER NEER MANUFACT COMPANY I
发明人
HENDERSON HOMER I
分类号
E21B17/16;E21B17/18;(IPC1-7):E21B17/04
主分类号
E21B17/16
代理机构
代理人
主权项
地址
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