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发明名称
Drilling Unit with Hollow Annular Drill Bit and Central Drill
摘要
申请公布号
CA2160043(A1)
申请公布日期
1996.04.16
申请号
CA19952160043
申请日期
1995.10.06
申请人
KLEINE, WERNER
发明人
KLEINE, WERNER
分类号
B23B31/113;B23B51/04;B28D1/14;(IPC1-7):B28D1/14;B28D1/26
主分类号
B23B31/113
代理机构
代理人
主权项
地址
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