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经营范围
发明名称
ROCK BOLT
摘要
A hollow rock bolt comprising a shaft having a spiral form protruding from the exterior surface of the shaft, wherein the spiral form has a flank angle of between 30° and 60°.
申请公布号
US2010202838(A1)
申请公布日期
2010.08.12
申请号
US20080675562
申请日期
2008.04.30
申请人
发明人
WEAVER STEVEN;HORSCH JOHN
分类号
E21D21/00;B23G9/00
主分类号
E21D21/00
代理机构
代理人
主权项
地址
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