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发明名称
OPTICAL-ACOUSTIC SYSTEM OF FOREIGN LANGUAGES TEACHING
摘要
申请公布号
GR60679(B)
申请公布日期
1978.07.10
申请号
GR19297801562
申请日期
1978.05.13
申请人
COUTSOUBOS P
发明人
COUTSOUBOS P
分类号
主分类号
代理机构
代理人
主权项
地址
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