Po’lat yong’inga qarshi eshik po’latdan yasalgan ramka va po’lat eshik bargidan iborat. Po’lat strukturasi ta’sir deformatsiyasiga va tashqi kuchning shikastlanishiga moyil emasligini ta’minlashi mumkin va uzoq vaqt davomida almashtirilmasdan normal ishlatilishi mumkin.

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