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发明名称
Improvements in connection with photographic contact-printing machines
摘要
申请公布号
GB498750(A)
申请公布日期
1939.01.09
申请号
GB19370018877
申请日期
1937.07.07
申请人
BENJAMIN FAIRFAX HALL;B. J. HALL & COMPANY LIMITED
发明人
分类号
G03B27/22
主分类号
G03B27/22
代理机构
代理人
主权项
地址
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