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Qo’shtavr (qo’shtavrli balka), S255 markali uglerodli po’latdan yasalgan, o’lchami 582x300 mm bo’lgan, parallel tokchali 60Sh1 keng tokchali qo’shtavrli to’sin — MXIK (IKPU) kodi 07216001004000216 · Tasnif by Krafta