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发明名称
Apparatus for perforating sheet material
摘要
申请公布号
US2317424(A)
申请公布日期
1943.04.27
申请号
US19420434376
申请日期
1942.03.12
申请人
WALES GEORGE F
发明人
WALES GEORGE F.
分类号
B21D28/26
主分类号
B21D28/26
代理机构
代理人
主权项
地址
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