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发明名称
Device for protecting photographic roll films from edge fog
摘要
申请公布号
US1794280(A)
申请公布日期
1931.02.24
申请号
US19290353143
申请日期
1929.04.06
申请人
THE HOUGHTON-BUTCHER MANUFACTURING COMPANY, LIMITED
发明人
DENNISS ALFRED JOSEPH;EDWARDS VALENTINE WILLIAM
分类号
G03C3/00
主分类号
G03C3/00
代理机构
代理人
主权项
地址
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