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发明名称
Expanding chisel
摘要
申请公布号
US2504176(A)
申请公布日期
1950.04.18
申请号
US19470782788
申请日期
1947.10.29
申请人
EUGENE BREHMER
发明人
BREHMER EUGENE
分类号
B25D3/00
主分类号
B25D3/00
代理机构
代理人
主权项
地址
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