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Kuyika Machubu ndi Ma Valves a Zida
Timapereka zinthu zapamwamba zotsika mtengo kwa mafakitale padziko lonse lapansi omwe ali ndi chidwi ndi zombo za m'madzi, mafakitale amagetsi a nyukiliya, mafakitale opangira zinthu, mafakitale opangira zamkati ndi mapepala, komanso opanga mafuta m'nyanja.
