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发明名称
Paper holder for making photographic enlargements
摘要
申请公布号
US2599859(A)
申请公布日期
1952.06.10
申请号
US19510206804
申请日期
1951.01.19
申请人
JOHN A. LOUDON;PAUL A. LUDDINGTON
发明人
OGG LEON L.
分类号
G03B27/58
主分类号
G03B27/58
代理机构
代理人
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地址
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