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Helicopter noise reduction
Helicopter noise reduction
Reducing the noise caused by helicopters
en-GB
/ˈhɛlɪˌkɒptə ˈnɔɪz ɹɪˈdʌkʃn/
en-US
/ˈhɛlɪˌkɑptɚ ˈnɔɪz ɹɪˈdʌkʃən/
Categories:
acoustic quieting