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发明名称
Vormleerbord tot aanschouwing en rechtstreekse afleiding van vlakkenformules.
摘要
申请公布号
BE598618(A2)
申请公布日期
1961.04.14
申请号
BE19600598618
申请日期
1960.12.28
申请人
AUGUST ALBERT VERBOVEN
发明人
AUGUST ALBERT VERBOVEN
分类号
(IPC1-7):G09B
主分类号
(IPC1-7):G09B
代理机构
代理人
主权项
地址
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