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发明名称
Improvements in and relating to blackboards and the like
摘要
申请公布号
GB759050(A)
申请公布日期
1956.10.10
申请号
GB19530031886
申请日期
1953.11.17
申请人
UNIQUE BALANCE COMPANY LIMITED
发明人
分类号
A47B97/06
主分类号
A47B97/06
代理机构
代理人
主权项
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