Ufungaji laini huangaliwa kwanza ili kuona ikiwa ina cheti cha kufuata. Kila ukanda wa kuinua umekaguliwa kwa uangalifu kabla ya kuondoka kiwandani na una cheti cha kufuata
Shackle ni aina ya kombeo, ambayo hutumiwa sana katika tasnia mbali mbali kama nguvu ya umeme, madini, mafuta, mashine, reli, tasnia ya kemikali, bandari, madini, ujenzi na kadhalika.
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