摘要：

An optical seal comparator which uses the optic path formed by combination of splitter mirror with mirror, and other optic accessories, making comparison between pattern of compared seal and that of standard one by projection on the same optic plan, then through the overlapping process to achieve precise comparison. In order to speed up the process, the unit uses alternating electronic signals to control brightness of the two patterns, making display one after the other to pinpoint the inconsistent part from the overlap by showing flickered image.

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