Hissing old tv:
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Android notification sound
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Windows notification sound
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Air conditioning (outdoor unit)
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Sewing machine
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Air cut, Fan blade rotation
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Computer turning on, humming fan, off
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Portable fan
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Electric wheelchair
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Sound to start presentation
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Whatsapp notification sound
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Defrost process, Spaceship freezer
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Hard disk, read, spin
★★★★★