Damascus steel's lost secret found - tribunedigital-chicagotribune. Aug 13, 2001 ... Legend had it that the metal, stronger and sharper than some steels ... they re-created the old metal using modern rolling mill techniques. ... but many scholars believe Muslims from Egypt to India used it for hundreds of years before that. ... that a key might be forming the metal by hand, with a hammer.
آسیاب توپ برای کارخانه سیمان. آسیاب توپ برای کارخانه سیمان Ball mill Wikipedia A ball mill is a type of grinder used to grind and blend materials for use in mineral dressing widely used in production lines for powders such as cement, silies, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of
