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发明名称
Photographic camera lens system
摘要
申请公布号
US2506947(A)
申请公布日期
1950.05.09
申请号
US19470791897
申请日期
1947.12.15
申请人
WALKER JOSEPH B
发明人
WALKER JOSEPH B.
分类号
G03B19/18
主分类号
G03B19/18
代理机构
代理人
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