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发明名称
Film holder with light valves or guards
摘要
申请公布号
US2339658(A)
申请公布日期
1944.01.18
申请号
US19420464472
申请日期
1942.11.04
申请人
THE FOLMER GRAFLEX CORPORATION
发明人
SMITH BYRON L.
分类号
G03B17/26
主分类号
G03B17/26
代理机构
代理人
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