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发明名称
Optical apparatus
摘要
申请公布号
US1889284(A)
申请公布日期
1932.11.29
申请号
US19310510795
申请日期
1931.01.23
申请人
WILLIAM HANSEL CARL
发明人
HANSEL CARL WILLIAM
分类号
G09B23/22
主分类号
G09B23/22
代理机构
代理人
主权项
地址
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