Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Tools and Equipment (hierarchy name)
5. equipment
6. [equipment by process]
7. [grinding and milling equipment]
8. [grinding and milling machinery]
9. mills (equipment)
10. milling machines

Anotations

Scope note:

Mills that employ cylinders or are in the shape of a cylinder. Examples include cylindrical containers built to varying length-to-diameter ratios and are partially filled with flint stones, iron or steel balls, or other grinding bodies that tumble under the influence of gravity by revolving the container. Other examples include devices that grind grain or other materials by means of two counter-rotating roughened cylinders turning at different speeds.