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发明名称
Zoom viewfinder with front diaphragm mask
摘要
申请公布号
US3141921(A)
申请公布日期
1964.07.21
申请号
US19590859379
申请日期
1959.12.14
申请人
BELL & HOWELL COMPANY
发明人
LINKE WALTER R.
分类号
G02B23/14
主分类号
G02B23/14
代理机构
代理人
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