Yong’inga chidamli og’ir eshiklar

Olovga chidamli og’ir eshik juda bardoshli va shamol bosimining deformatsiyasiga chidamliligi ham juda kuchli. Bu ko’p qavatli aholi uchun afzal qilingan eshik turi. Olovga chidamli og’ir eshiklarning profillari alyuminiy, stronsiy, mis, magniy, marganets va boshqa qotishmalardan tayyorlangan bo’lib, ular mustahkamlikda katta afzalliklarga ega.

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