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发明名称
Film holder
摘要
申请公布号
US2327108(A)
申请公布日期
1943.08.17
申请号
US19400356950
申请日期
1940.09.16
申请人
DON HEYER
发明人
HEYER DON
分类号
G03B21/32
主分类号
G03B21/32
代理机构
代理人
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地址
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