File:Обратный клапан для бурильных труб.jpg
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![File:Обратный клапан для бурильных труб.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/24/%D0%9E%D0%B1%D1%80%D0%B0%D1%82%D0%BD%D1%8B%D0%B9_%D0%BA%D0%BB%D0%B0%D0%BF%D0%B0%D0%BD_%D0%B4%D0%BB%D1%8F_%D0%B1%D1%83%D1%80%D0%B8%D0%BB%D1%8C%D0%BD%D1%8B%D1%85_%D1%82%D1%80%D1%83%D0%B1.jpg/800px-%D0%9E%D0%B1%D1%80%D0%B0%D1%82%D0%BD%D1%8B%D0%B9_%D0%BA%D0%BB%D0%B0%D0%BF%D0%B0%D0%BD_%D0%B4%D0%BB%D1%8F_%D0%B1%D1%83%D1%80%D0%B8%D0%BB%D1%8C%D0%BD%D1%8B%D1%85_%D1%82%D1%80%D1%83%D0%B1.jpg?20200708074518)
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