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发明名称
Mechanical pencil
摘要
申请公布号
US2170761(A)
申请公布日期
1939.08.22
申请号
US19390249681
申请日期
1939.01.07
申请人
NORMA MULTIKOLOR, INC.
发明人
MAUCHER HANS
分类号
B43K24/12
主分类号
B43K24/12
代理机构
代理人
主权项
地址
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