Ndi chitukuko chofulumira cha ntchito yomanga m'zaka zaposachedwa, zitsulo zopangira zitsulo zakhala zikugwiritsidwa ntchito kwambiri.
Steel springboard ndi mtundu wa zida zomangira pantchito yomanga.Nthawi zambiri, imatha kutchedwa zitsulo zopangira zitsulo,
zomangamanga zitsulo masika, chitsulo chopondaponda, kanasonkhezereka zitsulo masika, kanasonkhezereka zitsulo pedal, ndipo ndi bwino analandiridwa ndi shipbuilding
mafakitale, nsanja yamafuta, mphamvu zamagetsi ndi mafakitale omanga.
Nthawi yotumiza: May-07-2021