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发明名称
Multiple element varifocal system
摘要
申请公布号
US2970516(A)
申请公布日期
1961.02.07
申请号
US19570633865
申请日期
1957.01.14
申请人
BACK FRANK G;HERBERT LOWEN
发明人
BACK FRANK G.;LOWEN HERBERT
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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