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M. D Liying Wang took part in the 22th...
SIGMA was honored with General...
SIGMA was honored with ultraviolet...
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Sigma has a large number of patents and has been regarded as a "Shanghai Hi-tech Enterprise" since 2001. Our independent research and development for the SS-03 and SS-05 ultraviolet phototherapy units won us the “Shanghai A-level High-Tech Achievements Transformation Project" in 2002.
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