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发明名称
Convergent rays safety lens
摘要
申请公布号
US2287820(A)
申请公布日期
1942.06.30
申请号
US19400364717
申请日期
1940.11.07
申请人
NYSTROM GUSTAF H
发明人
NYSTROM GUSTAF H.
分类号
G02B3/08
主分类号
G02B3/08
代理机构
代理人
主权项
地址
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