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发明名称
Scratcher for well bores
摘要
申请公布号
US2683491(A)
申请公布日期
1954.07.13
申请号
US19510229360
申请日期
1951.06.01
申请人
BAKER OIL TOOLS, INC.
发明人
GASSAWAY JAMES S.
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
地址
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