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发明名称
Improvements in devices for punching holes in sheet metal
摘要
申请公布号
GB511806(A)
申请公布日期
1939.08.24
申请号
GB19380015361
申请日期
1938.05.23
申请人
A. T. S. COMPANY LIMITED;JACK RANSOM
发明人
分类号
B21D28/34
主分类号
B21D28/34
代理机构
代理人
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