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发明名称
Combined fire shutter and observation window for motion picture projection booths
摘要
申请公布号
US2239104(A)
申请公布日期
1941.04.22
申请号
US19380189112
申请日期
1938.02.07
申请人
KERN EMIL A
发明人
KERN EMIL A.
分类号
G03B21/18
主分类号
G03B21/18
代理机构
代理人
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地址
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