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发明名称
Slide file
摘要
申请公布号
US2704901(A)
申请公布日期
1955.03.29
申请号
US19530376385
申请日期
1953.08.25
申请人
HULSE GENE W
发明人
HULSE GENE W.
分类号
G03B21/54
主分类号
G03B21/54
代理机构
代理人
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