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发明名称
Blackboard eraser
摘要
申请公布号
US1942205(A)
申请公布日期
1934.01.02
申请号
US19320646671
申请日期
1932.12.10
申请人
ELNETT ANTHONY A
发明人
ELNETT ANTHONY A.
分类号
B43L21/00
主分类号
B43L21/00
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