Iimveliso
Iibheringi ezizotyiweyo zenaliti ezizotyiweyo zineendonga ezicekethekileyo, ezizotyiweyo zekomityi yangaphandle kunye nerola yenaliti kunye nekheji yokuhlangana. Ikomityi ezotyiweyo yentsimbi eqinisiweyo kunye nenaliti yokuqengqeleka kunye nekheji yokudityaniswa kwezi bheringi zenza iyunithi engahlukiyo. ngesiphelo esivaliweyo zisetyenziselwa ukuvala i-shaft ekupheleni kweendawo zokuthwala.