cement mixer 
noun
A machine with a revolving drum used for mixing cement with sand, gravel, and water to make concrete.A character walking on concrete makes the sound of a pencil tapping a tabletop, and footsteps on a lawn sound like gravel in a cement mixer....
- The cement mixer remains, but the Dillon tools were gone, replaced by commercial loading equipment as well as machines designed and built for Black Hills.
- A 52-year-old shopkeeper who claimed a back injury hindered him in lifting heavy objects was photographed carrying a cement mixer.
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