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发明名称
Hollow trip casing spear
摘要
申请公布号
US2105885(A)
申请公布日期
1938.01.18
申请号
US19350000615
申请日期
1935.01.07
申请人
HINDERLITER FRANK J
发明人
HINDERLITER FRANK J.
分类号
E21B31/20
主分类号
E21B31/20
代理机构
代理人
主权项
地址
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