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发明名称
ROCK DRILL BIT
摘要
申请公布号
CA395544(A)
申请公布日期
1941.04.01
申请号
CAD395544
申请日期
申请人
ERNEST CRAIG
发明人
ERNEST CRAIG
分类号
主分类号
代理机构
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主权项
地址
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