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发明名称
Extension bit
摘要
申请公布号
US2430392(A)
申请公布日期
1947.11.04
申请号
US19450571787
申请日期
1945.01.08
申请人
DRAGOO FAY H
发明人
DRAGOO FAY H.
分类号
B23B31/02
主分类号
B23B31/02
代理机构
代理人
主权项
地址
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