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发明名称
SCHUL-WANDTAFELKREIDE.
摘要
申请公布号
DE1681787(U)
申请公布日期
1954.08.19
申请号
DE195400K4858U
申请日期
1954.02.23
申请人
JUERGEN KNOPF
发明人
JUERGEN KNOPF
分类号
主分类号
代理机构
代理人
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