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发明名称
Improvements in letter cards
摘要
申请公布号
GB517560(A)
申请公布日期
1940.02.01
申请号
GB19390000663
申请日期
1939.01.09
申请人
OTTOKAR WALDES
发明人
分类号
B42D15/08
主分类号
B42D15/08
代理机构
代理人
主权项
地址
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