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发明名称
Mechanical focus maintaining apparatus for a slide projector
摘要
申请公布号
GB1133409(A)
申请公布日期
1968.11.13
申请号
GB19670039809
申请日期
1967.08.31
申请人
BELL & HOWELL COMPANY
发明人
BADALICH FRANK CYRIL
分类号
G03B21/53
主分类号
G03B21/53
代理机构
代理人
主权项
地址
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