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发明名称
Exposure guard for cameras
摘要
申请公布号
US1911258(A)
申请公布日期
1933.05.30
申请号
US19310542954
申请日期
1931.06.08
申请人
LOUIS BENDER
发明人
BENDER LOUIS
分类号
G03B17/42
主分类号
G03B17/42
代理机构
代理人
主权项
地址
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