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发明名称
Dispositif didactique.
摘要
申请公布号
BE576333(A1)
申请公布日期
1959.07.01
申请号
BE19590576333
申请日期
1959.03.04
申请人
EUGENE PIERRE PHILIPPE SPILEERS
发明人
EUGENE PIERRE PHILIPPE SPILEERS
分类号
(IPC1-7):G09B
主分类号
(IPC1-7):G09B
代理机构
代理人
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地址
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