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经营范围
发明名称
Mechanical pencil
摘要
申请公布号
US2009182(A)
申请公布日期
1935.07.23
申请号
US19310578388
申请日期
1931.12.01
申请人
DAVID KAHN, INC.
发明人
KAHN JULIUS
分类号
B43K21/08
主分类号
B43K21/08
代理机构
代理人
主权项
地址
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