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发明名称
摘要
申请公布号
JPH0428675(U)
申请公布日期
1992.03.06
申请号
JP19900070880U
申请日期
1990.07.02
申请人
发明人
分类号
G09B23/28;G09B23/34;(IPC1-7):G09B23/28
主分类号
G09B23/28
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