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发明名称
Appareil photomécanique à écrans demi-ton
摘要
申请公布号
FR1222892(A)
申请公布日期
1960.06.14
申请号
FR19590786991
申请日期
1959.02.17
申请人
POWERS CHEMCO, INC.
发明人
分类号
G03B27/66
主分类号
G03B27/66
代理机构
代理人
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