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发明名称
Optisches Signalzeichen
摘要
申请公布号
DE831376(C)
申请公布日期
1952.02.14
申请号
DE1950N001487
申请日期
1950.07.14
申请人
WALTER NISSEN
发明人
NISSEN WALTER
分类号
G09F13/14;G09F13/16
主分类号
G09F13/14
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代理人
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