Chodulira cha makina awa chimagwiritsa ntchito kapangidwe kapadera ka kholo ndi mwana, komwe kamatha kudula pamwamba ndi pansi pa chilichonse
mbiri nthawi imodzi mu mkhalidwe uliwonse, ndipo imatha kudula mbiri zophimbidwa mbali zonse ziwiri mokhazikika kwa nthawi yayitali.