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发明名称
Improvements in or relating to light filters
摘要
申请公布号
GB457708(A)
申请公布日期
1936.11.30
申请号
GB19350015764
申请日期
1935.05.30
申请人
I.G. FARBENINDUSTRIE AKTIENGESELLSCHAFT
发明人
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主分类号
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