Effective rock cutting tool for drilling small diameter for oil and gas von Ju. E. Budjukov, V. I. Spirin

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Shaft cutters for geological exploration von V. I. Spirin, Ju. E. Budjukov, V. P. Onishchin

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Criteria of the optimal duration when drilling shells with removable core receiver von Ju. E. Budjukov, V. I. Spirin, L. K. Gorshkov, V. P. Onishchin

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