Report - Boreholes : A. Boreholes drillinghorizon.documentation.ird.fr/exl-doc/pleins_textes/divers16-07/010048825.pdf · 2.3.1 ROTATION,PRESSUREANDLIFTINGFORCE Therotationistransmittedmechanically(motor,gearbox,clutchorkellyonlargemachines)tothe

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