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经营范围
发明名称
Mechanical pencil
摘要
申请公布号
US2517297(A)
申请公布日期
1950.08.01
申请号
US19470758935
申请日期
1947.07.03
申请人
FRED FERBER
发明人
FERBER FRED
分类号
B43K21/22
主分类号
B43K21/22
代理机构
代理人
主权项
地址
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