File:Рисунки к статье «Искусственные препятствия». Военная энциклопедия Сытина (Санкт-Петербург, 1911-1915).jpg
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![File:Рисунки к статье «Искусственные препятствия». Военная энциклопедия Сытина (Санкт-Петербург, 1911-1915).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/90/%D0%A0%D0%B8%D1%81%D1%83%D0%BD%D0%BA%D0%B8_%D0%BA_%D1%81%D1%82%D0%B0%D1%82%D1%8C%D0%B5_%C2%AB%D0%98%D1%81%D0%BA%D1%83%D1%81%D1%81%D1%82%D0%B2%D0%B5%D0%BD%D0%BD%D1%8B%D0%B5_%D0%BF%D1%80%D0%B5%D0%BF%D1%8F%D1%82%D1%81%D1%82%D0%B2%D0%B8%D1%8F%C2%BB._%D0%92%D0%BE%D0%B5%D0%BD%D0%BD%D0%B0%D1%8F_%D1%8D%D0%BD%D1%86%D0%B8%D0%BA%D0%BB%D0%BE%D0%BF%D0%B5%D0%B4%D0%B8%D1%8F_%D0%A1%D1%8B%D1%82%D0%B8%D0%BD%D0%B0_%28%D0%A1%D0%B0%D0%BD%D0%BA%D1%82-%D0%9F%D0%B5%D1%82%D0%B5%D1%80%D0%B1%D1%83%D1%80%D0%B3%2C_1911-1915%29.jpg/800px-thumbnail.jpg?20170928224711)
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