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发明名称
Test drill
摘要
申请公布号
US2165685(A)
申请公布日期
1939.07.11
申请号
US19370174914
申请日期
1937.11.17
申请人
STURGES FRANK C
发明人
STURGES FRANK C.
分类号
E21B25/00
主分类号
E21B25/00
代理机构
代理人
主权项
地址
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