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发明名称
摘要
申请公布号
NL76353(C)
申请公布日期
1954.06.15
申请号
NL19480143509
申请日期
1948.11.25
申请人
发明人
分类号
G06K21/02;G06K21/04;H04M15/38
主分类号
G06K21/02
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代理人
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