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发明名称
POSITIVE OPTICAL SYSTEM
摘要
申请公布号
US3583785(A)
申请公布日期
1971.06.08
申请号
USD3583785
申请日期
1969.09.02
申请人
BELL & HOWELL CO.
发明人
JACK B. BOARDMAN
分类号
G02B3/04;G02B23/14;(IPC1-7):G02B21/00;G02B23/00
主分类号
G02B3/04
代理机构
代理人
主权项
地址
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