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  • Ventilation and noise reduction and noise reduction project
    Ventilation and noise reduction and noise reduction project
    2018-06-27
    Engineering Introduction: The ventilation and sound insulation window is a device for reducing the sound transmission process by using a separate steel or aluminum alloy section with sound absorption and special structure. The utility model comprises two window frames, middle stands, and inner and outer glass windows installed between the window frames and the middle stands. At present, there are many professional research institutions and enterprises and institutions in Chin
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