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发明名称
Drill pipe protector
摘要
申请公布号
US2959453(A)
申请公布日期
1960.11.08
申请号
US19560581221
申请日期
1956.04.27
申请人
JACOBS HARVEY C
发明人
JACOBS HARVEY C.
分类号
E21B17/10
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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