Hunhu kabhoni yekugadzira simbi inopisa-yakakungurutswa yakaderera-kudzvanywa boiler chubhu inoshandiswa kugadzira akasiyana dhizaini yakaderera uye yepakati dhizaini boiler inopisa mutsi pombi, inotenderedza pombi dzemvura uye inopisa inopisa inopisa locomotive boiler machubhu, opium pombi, pombi diki uye zvidhinha arch machubhu uye inotonhora Stubbs ( yakakungurutswa)...
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