ЧПУ (нарезание наружной резьбы.)
Нарезание наружной резьбы, на горизонтально расточном станке с ЧПУ, резьбо фрезой
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![Храм Ченнакешава. Зачем предки сделали такие сложные столбы? [№ .]](https://sun9-42.userapi.com/rm_6lZmeg2vYF3X_GJY1R_HPlp-MAPGLJ6iJfg/B8BxL2ONqCY.jpg)
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