Og’ir po’latdan yasalgan bitta yong’in eshigi juda bardoshli. Haqiqiy foydalanishda temir eshikni tashqi tomondan shikastlash oson emas va ichki materiallarni himoya qilishi mumkin. Og’ir yong’inga qarshi eshik yuqori sifatli apparat qismlarini qabul qiladi, ular aşınmaya bardoshli va uzoq xizmat muddatiga ega.

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