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发明名称
SCHREIB- UND ZEICHEN-TAFEL.
摘要
申请公布号
DE1756221(U)
申请公布日期
1957.11.14
申请号
DE195700H5812U
申请日期
1957.08.19
申请人
PAUL HECK
发明人
PAUL HECK
分类号
主分类号
代理机构
代理人
主权项
地址
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