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发明名称
Framing light shutter lifter
摘要
申请公布号
US1870463(A)
申请公布日期
1932.08.09
申请号
US19300445996
申请日期
1930.04.21
申请人
NELSON WALDO P
发明人
NELSON WALDO P.
分类号
G03B21/18
主分类号
G03B21/18
代理机构
代理人
主权项
地址
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