Rollers: taug qab cov menyuam, sprocket, sab saum toj cov menyuam, pem hauv ntej idler
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Taug qab cov menyuam rau crawler excavator drilling rig crane
Cov khoom hauv qab yog muab faib ua: cov menyuam taug qab, cov menyuam sab saum toj, idler, sprocket, roj hmab thiab steel khiav.