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发明名称
Bit grab
摘要
申请公布号
US3081123(A)
申请公布日期
1963.03.12
申请号
US19600027889
申请日期
1960.05.09
申请人
STEED CHARLES O
发明人
STEED CHARLES O.
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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