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经营范围
发明名称
Drill bit retriever
摘要
申请公布号
US2848268(A)
申请公布日期
1958.08.19
申请号
US19550549732
申请日期
1955.11.29
申请人
HARRY CAMBEIS
发明人
MCAULIFFE DENNIS N.
分类号
E21B31/18
主分类号
E21B31/18
代理机构
代理人
主权项
地址
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