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发明名称
Self cleaning blackboard
摘要
申请公布号
GB811276(A)
申请公布日期
1959.04.02
申请号
GB19570008383
申请日期
1957.03.14
申请人
FREDERICK JOHN KNIGHT
发明人
分类号
B43L1/08;B43L21/00
主分类号
B43L1/08
代理机构
代理人
主权项
地址
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