Electronic engraving Printing plate engraving with a stylus controlled by a light sensitive cell scanning the original.
电子雕刻用光扫描器扫描原稿，然后由光电池控制的钢针雕刻，造成印版。
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The black-light pen or watermark stylus was a specialized felt-tipped marker originally designed by museums, restores, and forgery police to place invisible marks on items.