Computer turning on, off, humming fan:
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Air conditioning (outdoor unit)
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Portable fan
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Sound to start presentation
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Email message sound
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Sewing machine
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Read, spin, Hard disk
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Whatsapp notification sound
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Spaceship freezer, defrost process
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On, off, Air conditioning
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Cool sound for notification
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IPhone notification sound
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Computer turning on, off, humming fan
★★★★★