China International Optics Fair - Beijing 2023 Beijing
2022 Shanghai fair cancel, let's go back to 2021 Beijing optical fair-Hongchen. 因疫情取消的上海展，那就让我们回忆一下2021北京展吧。 | By Jiangsu Hongchen Optical Co., Ltd | Facebook
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China International Optics Fair - Beijing 2023 Beijing
