A. Ibisobanuro by'Umugozi wo Kurwanya Nut n'Umugozi Mwiza
Udupira two ku ntete n'udupira tworoshye byombi ni ubwoko bw'udupira two guhuza, dukoreshwa mu gusana no gukuraho ibice bya mekanike n'imiterere, kandi akenshi dukoreshwa mu bijyanye n'imashini, inganda za shimi, ingufu z'amashanyarazi n'ibindi. Ubwoko bwombi bw'udupira buhuza udupira, ariko hari itandukaniro.