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发明名称
Depth-of-focus indicator for photographic instruments
摘要
申请公布号
US3021774(A)
申请公布日期
1962.02.20
申请号
US19590805559
申请日期
1959.04.10
申请人
JOS. SCHNEIDER & CO.
发明人
EWALD WALDEMAR
分类号
G03B17/02
主分类号
G03B17/02
代理机构
代理人
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地址
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