Da farko, da zane don ƙayyade da kuma kera molds, gilashin kwalban albarkatun kasa zuwa yashi ma'adini a matsayin babban albarkatun kasa, guda biyu tare da wasu na'urorin haɗi a cikin babban zafin jiki narkar da ruwa, sa'an nan lafiya mai kwalban allura mold, sanyaya, incision, tempering. , samuwar gl...
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