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English to Spanish translations [PRO] Tech/Engineering - Construction / Civil Engineering
English term or phrase:bottom sub
"In top-head drive machines, no kelly is required and therefore the sub of the hydraulic drive motor is connected directly to the drill rod."
..estoy traduciendo un texto sobre construccin de pozos y metodos de perforacion, especificamente sobre fluidos de perforacion, y me aparece ese termino que no se que puede ser, espero me puedan ayudar.