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经营范围
发明名称
Mechanical pencil
摘要
申请公布号
US2460323(A)
申请公布日期
1949.02.01
申请号
US19460681644
申请日期
1946.07.06
申请人
WEHN CHARLES E
发明人
WEHN CHARLES E.
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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