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发明名称
Improvements in signs
摘要
申请公布号
GB643105(A)
申请公布日期
1950.09.15
申请号
GB19480003294
申请日期
1948.02.04
申请人
VICTOR SHERIDAN
发明人
分类号
F21V8/00
主分类号
F21V8/00
代理机构
代理人
主权项
地址
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