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发明名称
Expansible drill bits
摘要
申请公布号
US2719699(A)
申请公布日期
1955.10.04
申请号
US19510235071
申请日期
1951.07.03
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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