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发明名称
Counterbore
摘要
申请公布号
US2207542(A)
申请公布日期
1940.07.09
申请号
US19380236275
申请日期
1938.10.21
申请人
HEDIN OSCAR C
发明人
HEDIN OSCAR C.
分类号
B23B51/10
主分类号
B23B51/10
代理机构
代理人
主权项
地址
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