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发明名称
Magnifying device
摘要
申请公布号
US1804464(A)
申请公布日期
1931.05.12
申请号
US19280288603
申请日期
1928.06.27
申请人
DAYTON SCALE COMPANY
发明人
FULLER FREDERICK L.
分类号
G01G23/32
主分类号
G01G23/32
代理机构
代理人
主权项
地址
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