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经营范围
发明名称
Twist drill
摘要
A twist drill (1) has a plurality of of protuberances (9) arranged in the grooves (6) of the helix (4) which project radially outward partially into the groove cross section to prevent clumps.
申请公布号
US6571890(B2)
申请公布日期
2003.06.03
申请号
US20010814238
申请日期
2001.03.21
申请人
HILTI AKTIENGESELLSCHAFT
发明人
OBERMEIER JOSEF
分类号
B23B51/00;B23B51/02;B28D1/14;B28D1/26;E21B10/44;(IPC1-7):E21B10/44
主分类号
B23B51/00
代理机构
代理人
主权项
地址
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