PETROLEUM EXERCITATIO Bit Petroleum terebro frenum criticum in exercendis olei partibus agit, signanter exercendis qualitatem, efficientiam et impensas movens. Genera petrolei terebrae frena includunt strigili, cylindrus frena, lamella adamantina, et frena PDC (adias polycrystallina frena compacta). Haec ars...
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