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发明名称
Drill bit
摘要
申请公布号
US2955804(A)
申请公布日期
1960.10.11
申请号
US19580711517
申请日期
1958.01.27
申请人
WESTINGHOUSE AIR BRAKE COMPANY
发明人
FEUCHT JACOB E.
分类号
E21B17/04
主分类号
E21B17/04
代理机构
代理人
主权项
地址
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