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经营范围
发明名称
Mechanical pencil
摘要
申请公布号
US2293622(A)
申请公布日期
1942.08.18
申请号
US19400356235
申请日期
1940.09.10
申请人
DAVID KAHN, INC.
发明人
PARA JOHN WILLIAM
分类号
B43K21/12
主分类号
B43K21/12
代理机构
代理人
主权项
地址
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