Cement mixer is described as a machine, more commonly a truck , used to mix cement, more accurately, concrete.
The ingredients are added to the machine, or the Truck, and the barrel of the machine rotates. Paddles on the interior walls of the barrel mix the ingredients. The paddles are at an angle so that by reversing the direction of the rotation the concrete will rise out of the barrel.
Ref: 122396/2006-09-22
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Barrel (Barrel relates to a volumetric unit of measure ...)
Alternative Spellings (Synonyms): cements