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发明名称
Portable blackboard renovator
摘要
申请公布号
US1810336(A)
申请公布日期
1931.06.16
申请号
US19280291187
申请日期
1928.07.09
申请人
ALBERT BENNINGTON
发明人
BENNINGTON ALBERT
分类号
B24B27/027
主分类号
B24B27/027
代理机构
代理人
主权项
地址
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