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发明名称
Drill bit
摘要
申请公布号
US2326908(A)
申请公布日期
1943.08.17
申请号
US19420444955
申请日期
1942.05.29
申请人
WILLIAMS JR EDWARD B
发明人
JR. EDWARD B. WILLIAMS,
分类号
E21B10/48
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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