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发明名称
摘要
申请公布号
SE347822(B)
申请公布日期
1972.08.14
申请号
SE19690000037
申请日期
1969.01.03
申请人
BELL & HOWELL CO
发明人
JOHN R
分类号
G03B9/10;G03B41/10;(IPC1-7):G03B21/40
主分类号
G03B9/10
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