Noise absorption system having active acoustic liner
Noise attenuating and air streamlining spiral
Noise attenuating sound resonator for automotive cooling...
Noise cancellation device for centrifugal blower
Noise control device for centrifugal blower
Noise killing system of fans
Noise reduced centrifugal blower
Noise reduction mechanism of fan device and molding method...
Noise reduction of aircraft flap
Noiseless air-actuated turbine-type vibrator with muffler
Nonlinearly stacked low noise turbofan stator