Izintlu zokuqhushumba zisetyenziswa kakhulu kumashishini ahlukeneyo, ngakumbi lawo abandakanya{0}}iigesi zoxinzelelo oluphezulu kunye nezinto ezinokutsha neziqhumayo. Ezi zilandelayo zezinye izicelo eziqhelekileyo:
1. Ishishini lePetroleum neleMichiza: Kwizakhiwo ezifana neitanki zokugcina ioli, imizi-mveliso yeekhemikhali, neendawo zokuhluza, iziqhushumbisi zokudubula zikhusela izixhobo nabasebenzi kugqabhuko-dubulo lwequbuliso.
2. Ishishini lokuTya kunye namaYeza: Kwimveliso yokutya kunye nemveliso yamayeza, ulawulo lweendawo eziqhumayo kunye nokukhulula inkqubo yoxinzelelo, iqinisekisa indawo ekhuselekileyo yemveliso.
3. Ishishini laMandla: Kwizityalo zamandla kunye nezikhululo ezincinci, iindawo eziqhumayo zithintela umonakalo kwisixhobo sombane okanye iingozi ezibangelwa uxinzelelo olugqithisileyo lwangaphakathi.
4. Umzi-mveliso we-Aerospace: Kwii-injini zeenqwelo-moya kunye ne-propulsion systems yesipheke-pheke, iindawo ezidubulayo zikhusela izinto ezibalulekileyo kumothuko wokudubula.
