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摘要
申请公布号
US1832318(A)
申请公布日期
1931.11.17
申请号
US19310529364
申请日期
1931.04.11
申请人
EBERHARD FABER PENCIL CO.
发明人
MYERS HAROLD L.
分类号
G09F3/06;G09F23/00
主分类号
G09F3/06
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