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发明名称
Improvements in or relating to photographic darkslides
摘要
申请公布号
GB745703(A)
申请公布日期
1956.02.29
申请号
GB19530029970
申请日期
1953.10.29
申请人
HUNTER-PENROSE LIMITED;GEORGE EDWARD MESSENGER
发明人
分类号
G03B17/26
主分类号
G03B17/26
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