Работа интерактивной модели оптического телеграфа
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![[Волочай Иван - Практичные решения загородной жизни] Отопление частного дома — газ или электричество? Какое отопление выгоднее и](https://sun9-3.userapi.com/impg/vTCKuZeHqY9XD0vCiLOw7Z5xroCge1txNTEXfg/qYRjdkkuETY.jpg?size=320x240&quality=95&keep_aspect_ratio=1&background=000000&sign=188db27de5e87fb01d0cebe17ec40c74&c_uniq_tag=Xr0Rr5xCsMebeeNDpDTuHgiijKWZZPK7Mc42-0fkC18&type=video_thumb)
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