Ruushku waa soo dejinta saafiga ah ee electrodes graphite.Mugga sannadlaha ah ee soo dejinta ee graphite electrodes waa qiyaastii 40,000 tan, taas oo in ka badan kala badh kheyraadka ay ka yimaadaan Shiinaha, inta soo hartayna waxay ka yimaadaan Hindiya, Faransiiska iyo Spain.Laakiin isla mar ahaantaana, Ruushku waxa kale oo uu leeyahay ku dhawaad 20,000 oo tan oo garaaf ah.
Akhri wax dheeraad ah