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发明名称
Improvements in and relating to watermark detectors and the like
摘要
申请公布号
GB522018(A)
申请公布日期
1940.06.06
申请号
GB19380035026
申请日期
1938.12.01
申请人
HERMAN LEVY
发明人
分类号
B44F1/12;G01N33/34
主分类号
B44F1/12
代理机构
代理人
主权项
地址
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