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发明名称
LEHRGERAET ZUR EINFUEHRUNG IN DIE PROZENTBERECHNUNG.
摘要
申请公布号
DE1615604(U)
申请公布日期
1950.11.09
申请号
DE195000B3098U
申请日期
1950.09.13
申请人
HEINRICH BORK
发明人
HEINRICH BORK
分类号
主分类号
代理机构
代理人
主权项
地址
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