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发明名称
Mechanically actuated fine point eraser
摘要
申请公布号
US2431156(A)
申请公布日期
1947.11.18
申请号
US19460641433
申请日期
1946.01.16
申请人
WONDERS ALVIN W
发明人
WONDERS ALVIN W.
分类号
B43L19/00
主分类号
B43L19/00
代理机构
代理人
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