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发明名称
摘要
申请公布号
NL6915800(A)
申请公布日期
1970.04.23
申请号
NL19690015800
申请日期
1969.10.20
申请人
发明人
分类号
G03B17/24;G08G1/054;(IPC1-7):G08G1/10
主分类号
G03B17/24
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