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Ventilator pump mechanism up and down in a quiet hospital room.
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A close perspective recording of a hospital ventilator breathing in and out.
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Elevador Predial Entrando Ventilador Porta Fecha e Abre 3 Andar Corredor
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Elevador Predial Campainha Acensorista Diz Terreo Ventilador Porta Abre e Fecha Desce 3 Andar Abre Andar Rua
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Elevador Predial Com Acensorista Ventilador Porta Fecha e Abre 2 Andar Fecha e Abre 3 Andar
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Turning on an old computer with noisy ventilator