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发明名称
Improvements in signs
摘要
申请公布号
GB509385(A)
申请公布日期
1939.07.14
申请号
GB19380037304
申请日期
1938.12.22
申请人
LEROY HENRY DEY;ROBERT LYONS PIOSO
发明人
分类号
H05B41/24
主分类号
H05B41/24
代理机构
代理人
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