File:Руководство NIOSH по измерению загрязнённости воздуха промышленных предприятий. Фиг. Е-4..jpg
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![File:Руководство NIOSH по измерению загрязнённости воздуха промышленных предприятий. Фиг. Е-4..jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/%D0%A0%D1%83%D0%BA%D0%BE%D0%B2%D0%BE%D0%B4%D1%81%D1%82%D0%B2%D0%BE_NIOSH_%D0%BF%D0%BE_%D0%B8%D0%B7%D0%BC%D0%B5%D1%80%D0%B5%D0%BD%D0%B8%D1%8E_%D0%B7%D0%B0%D0%B3%D1%80%D1%8F%D0%B7%D0%BD%D1%91%D0%BD%D0%BD%D0%BE%D1%81%D1%82%D0%B8_%D0%B2%D0%BE%D0%B7%D0%B4%D1%83%D1%85%D0%B0_%D0%BF%D1%80%D0%BE%D0%BC%D1%8B%D1%88%D0%BB%D0%B5%D0%BD%D0%BD%D1%8B%D1%85_%D0%BF%D1%80%D0%B5%D0%B4%D0%BF%D1%80%D0%B8%D1%8F%D1%82%D0%B8%D0%B9._%D0%A4%D0%B8%D0%B3._%D0%95-4..jpg/567px-thumbnail.jpg?20140419142927)
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