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发明名称
摘要
申请公布号
NL6502056(A)
申请公布日期
1965.08.19
申请号
NL19650002056
申请日期
1965.02.18
申请人
发明人
分类号
G04B18/00;G04C3/10
主分类号
G04B18/00
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