Нарезание зубьев зубчатых колёс
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![Храм Ченнакешава. Зачем предки сделали такие сложные столбы? [№ .]](https://sun9-42.userapi.com/rm_6lZmeg2vYF3X_GJY1R_HPlp-MAPGLJ6iJfg/6sw32QXuRD8.jpg)
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