Sizning "Guruch kukuni darajasi: Cu50Zn50; Cu60Zn40; Cu70Zn30…, Standart: 22662-77; TU 48-21-701-80" mahsuloti haqida sharhingiz

Guruch kukuni darajasi: Cu50Zn50; Cu60Zn40; Cu70Zn30…, Standart: 22662-77; TU 48-21-701-80
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