(9) Kuwotcherera zitsulo zosapanga dzimbiri, chitsulo cha kaboni, pepala lokhala ndi galvanized, aluminiyamu, mkuwa…
(10) Yoyenera kulumikiza mipiringidzo yovuta komanso zipangizo zosiyanasiyana: Kulumikiza matako, Kulumikiza pa lap, Kulumikiza pa stitch, Kulumikiza misomali, Kulumikiza pa crimping, Kulumikiza pa T, Kulumikiza pa lap stack, Kulumikiza pa edge