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发明名称
Magnifying device
摘要
申请公布号
US1936712(A)
申请公布日期
1933.11.28
申请号
US19310521100
申请日期
1931.03.09
申请人
BARNES FOSTER FRANK
发明人
FOSTER FRANK BARNES
分类号
G02B25/02
主分类号
G02B25/02
代理机构
代理人
主权项
地址
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