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发明名称
Improvements in and relating to optical signalling
摘要
申请公布号
GB378039(A)
申请公布日期
1932.08.02
申请号
GB19310012943
申请日期
1931.05.01
申请人
LARS DANNEVIG
发明人
分类号
G08B5/22
主分类号
G08B5/22
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代理人
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