Honorary qualifications
Invention patent certificate for a dust cleaning device on the inner wall of a ventilation duct
2024-07-13 15:00:35
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2
Invention patent certificate for a type of air duct with good filtering effect
2024-07-13 14:59:52
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1
A utility model patent certificate for a uniform sizing device used in papermaking
2024-07-13 14:59:40
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1