Mphero ndi makina omwe amagwiritsa ntchito chubu chozungulira chozungulira, chotchedwa chipinda chopera, chomwe chimakhala chodzaza pang'ono ndi zinthu zopera monga mipira yachitsulo, mipira ya ceramic, kapena ndodo.Zinthu zomwe ziyenera kupedwa zimadyetsedwa m'chipinda chopera, ndipo chipindacho chikazungulira, grindin ...
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