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发明名称
Dispositif à anneaux ouvrables pour relier des feuilles amovibles perforées.
摘要
申请公布号
CH271137(A)
申请公布日期
1950.10.15
申请号
CHD271137
申请日期
1947.02.01
申请人
MASSARD,PAUL-DAVID
发明人
MASSARD,PAUL-DAVID
分类号
B42F13/18
主分类号
B42F13/18
代理机构
代理人
主权项
地址
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