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发明名称
BLACKBOARD ERASER
摘要
申请公布号
CA893207(A)
申请公布日期
1972.02.15
申请号
CAD893207
申请日期
1970.12.22
申请人
RONALD E. FRASER
发明人
RONALD E. FRASER
分类号
B43L21/00
主分类号
B43L21/00
代理机构
代理人
主权项
地址
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