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发明名称
Mechanical lead pencil
摘要
申请公布号
US2604876(A)
申请公布日期
1952.07.29
申请号
US19500157318
申请日期
1950.04.21
申请人
DONALD STEUCK
发明人
STEUCK DONALD
分类号
B43K24/14
主分类号
B43K24/14
代理机构
代理人
主权项
地址
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