Amandla Efekthri
Ngomlando weminyaka eyishumi, manje ifektri ihlanganisa indawo engamamitha-skwele angama-30000, ifakwe umshini wokubumba umjovo wokusebenza okuphezulu, umshini wegwebu we-PU, umshini wokuhlola izinga lokushisa ongashintshi, umshini wokukhipha i-vacuum, umshini wokupakisha ngokuzenzakalela neminye imishini ethuthukisiwe, siqinisekisa ukuthi hlinzeka ngemikhiqizo enekhwalithi ephezulu.