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发明名称
Blackboard eraser
摘要
申请公布号
US3262145(A)
申请公布日期
1966.07.26
申请号
US19650488383
申请日期
1965.09.20
申请人
PROGRESSIVE PRODUCTS, INC.
发明人
CARLSON GILBERT F.
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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