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发明名称
Variable magnification optical system
摘要
申请公布号
US2514239(A)
申请公布日期
1950.07.04
申请号
US19480055967
申请日期
1948.10.22
申请人
W. WATSON & SONS LIMITED
发明人
HOPKINS HAROLD HORACE
分类号
G02B15/14
主分类号
G02B15/14
代理机构
代理人
主权项
地址
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