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I dissolve empty boards in acid, restore copper by electrolysis, and tin acid and lead sulfate with hydrogen at high temperature. Email: [email protected] Telegram: https://t.me/Pirroxim Rutube: https://rutube.ru/channel/39285211/ ZEN: https://dzen.ru/id/66ad387a10e3722c6d... VK Video: https://vk.com/club226927521