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经营范围
发明名称
Automatic lead pencil
摘要
申请公布号
US1789760(A)
申请公布日期
1931.01.20
申请号
US19300438217
申请日期
1930.03.22
申请人
KIEDROWSKI JOHN A
发明人
KIEDROWSKI JOHN A.
分类号
B43K24/14
主分类号
B43K24/14
代理机构
代理人
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