Computer turning on, off, humming fan:
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Exhaust fan
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Cool sound for notification
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Spaceship freezer, defrost process
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Computer turning on, humming fan, off
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Electronic melody for SMS alerts
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Electric razor
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Read, spin, Hard disk
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On, off, Air conditioning
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Portable fan
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Electric wheelchair
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Android notification sound
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Air conditioning (outdoor unit)
★★★★★