Rau cov saw hom thoob elevator, ususally muaj muaj ob daim sib txuas cov saw. Cov saw hlau yog nyob rau sab saum toj lossis hauv qab. Muaj ib nkawm tsav pulley thiab khoov pulley. Yog li, muaj qee qhov sib txawv ntawm lub thoob cov thoob.
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