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发明名称
Photographic print paper holder
摘要
申请公布号
US2495061(A)
申请公布日期
1950.01.17
申请号
US19470754904
申请日期
1947.06.16
申请人
SAMUEL HANSON CHARLES
发明人
HANSON CHARLES SAMUEL
分类号
G03B27/58
主分类号
G03B27/58
代理机构
代理人
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