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发明名称
Comparison magnifier
摘要
申请公布号
US2808761(A)
申请公布日期
1957.10.08
申请号
US19540472007
申请日期
1954.11.30
申请人
BAUSCH & LOMB OPTICAL COMPANY
发明人
JR. CHARLES J. DE GRAVE,
分类号
G02B25/02
主分类号
G02B25/02
代理机构
代理人
主权项
地址
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