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经营范围
发明名称
Electric pencil
摘要
申请公布号
US2031532(A)
申请公布日期
1936.02.18
申请号
US19330672697
申请日期
1933.05.24
申请人
DAVID G. EINSTEIN
发明人
GOLDMAN RALPH H.
分类号
H05B3/02
主分类号
H05B3/02
代理机构
代理人
主权项
地址
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