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发明名称
Blackboard eraser
摘要
申请公布号
US1928230(A)
申请公布日期
1933.09.26
申请号
US19320648997
申请日期
1932.12.27
申请人
GEORGE REYNOLDS WELLINGTON
发明人
REYNOLDS WELLINGTON GEORGE
分类号
B43L21/00
主分类号
B43L21/00
代理机构
代理人
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