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发明名称
Improvements in magnifying lenses for reading purposes
摘要
申请公布号
GB421620(A)
申请公布日期
1934.12.27
申请号
GB19330020439
申请日期
1933.07.20
申请人
HENRY JAMES BIRCHALL
发明人
分类号
G02B25/00
主分类号
G02B25/00
代理机构
代理人
主权项
地址
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