Chelik yong’inga qarshi eshikning eshik bargining ichki qismi inson tanasi uchun toksik bo’lmagan va zararsiz bo’lgan yangi turdagi ekologik toza olovga chidamli va issiqlik izolyatsiyalovchi material bilan to’ldirilgan. Bu yong’inga chidamli apparat aksessuarlaridan tashkil topgan ma’lum yong’inga chidamliligi bo’lgan temir yong’inga qarshi eshikdir.

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