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发明名称
Focusing device for cameras
摘要
申请公布号
US2025438(A)
申请公布日期
1935.12.24
申请号
US19350002808
申请日期
1935.01.21
申请人
BROWN BENJAMIN G
发明人
BROWN BENJAMIN G.
分类号
G03B19/12
主分类号
G03B19/12
代理机构
代理人
主权项
地址
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