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发明名称
摘要
申请公布号
DE2048820(A1)
申请公布日期
1972.04.06
申请号
DE19702048820
申请日期
1970.10.05
申请人
LETH A
发明人
分类号
G09B7/06;(IPC1-7):G09B7/06
主分类号
G09B7/06
代理机构
代理人
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