Mustafayev Oybek Bobomuradovich; Rustam Umarhanovich Djuraev; Abdixakimova Malika Amir qizi. IMPROVING OF THE EFFICIENCY OF CLEANING OF THE BOTTOM OF THE BOREHOLE FROM THE CRUSHED SLURRY ON THE BASIS OF IMPROVING OF THE CONSTRUCTION OF A THREE-BALLCHISEL. tajet 2022, 4, 79-91.