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发明名称
Magnifying device
摘要
申请公布号
US2297232(A)
申请公布日期
1942.09.29
申请号
US19390250828
申请日期
1939.01.13
申请人
KARL MARTIN;FRIEDRICH MOCKEL;WILHELM KAISER
发明人
MARTIN KARL;MOCKEL FRIEDRICH;KAISER WILHELM
分类号
G02B25/00
主分类号
G02B25/00
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代理人
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