http://petrishko.livejournal.com/ ([identity profile] petrishko.livejournal.com) wrote in [personal profile] russos 2008-10-23 10:58 pm (UTC)

Тоже простая математика. Геометрия... Курс "Металлорежущий инструмент" в любом машиностроительном ВУЗе.
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