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2019 utility model patent certificate
2019.12.06
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2018 utility model patent certificate
2018.06.02
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MUSIC CULTURE INDUSTRY EXPO (CHengdu)2017
2017.08.22
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Awarding ceremony of the twenty-sixth China international professional acoustics, lighting, musical instruments and Technology Exhibition
2017.06.13
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Utility model patent certificate: a three frequency point sound source coaxial loudspeaker box
2017.02.09
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