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发明名称
Rotary-Bohrgestaengeverbindung
摘要
申请公布号
DE944481(C)
申请公布日期
1956.06.14
申请号
DE1936R005980D
申请日期
1936.09.05
申请人
REED ROLLER BIT COMPANY
发明人
分类号
E21B17/042;F16L15/00
主分类号
E21B17/042
代理机构
代理人
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