Paul Nipkow obtains a patent in Germany for TV, using a selenium cell and a mechanical scanningdisk.
保罗·尼普可夫获得德国电视发明专利。他在电视技术中采用硒光电管和机械扫描盘。
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This avoid high cost by using post-pruning measure which require many times for scanningdisk data and amount of CPU time. So we gain a high efficiency.