Государственное Высшее Учебное Заведение "Приазовский Государственный Технический Университет"
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Priority to UAU201104351UpriorityCriticalpatent/UA64912U/en
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A device for drilling in which cutting blades are secured at different angles relative to the axis of body, the outer blade - at an angle of not less than 4°, and the inner blade – at an angle of not more than 12°, with the difference between the angles is no more than 8°.
UAU201104351U2011-04-112011-04-11Device for drilling holes
UA64912U
(en)