Amagwiritsidwa ntchito kwambiri pazinthu monga mbale zowunikira zowunikira, mbale zowunikira kumbuyo - makina owunikira ndi ma board otsatsa, komanso ma sheet owonekera monga a makabati owonetsera, zamagetsi ogula, zida zapakhomo, mafelemu ndi zida zomangira, ndipo ndi oyenera kutulutsa ndi kuumba jekeseni.
