Review for LEGO set 7990 Cement Mixer from Brickipedia
“The white and blue color-scheme is an homage to the first cement mixer; 6682 Cement Mixer from 1985. The cement truck features a cement drum which can be turned by a knob on the side. It also has a hose to pour the concrete (this is not realistic, as real trucks use a... More chute).”
Full review at brickipedia.fandom.com