
1) Grinding mill 2) Indian invention
Found on
https://www.crosswordclues.com/clue/roller-mill

Roller mills are mills that use cylindrical rollers, either in opposing pairs or against flat plates, to crush or grind various materials, such as grain, ore, gravel, plastic, and others. Roller grain mills are an alternative to traditional millstone arrangements in gristmills. Roller mills for rock complement other types of mills, such as ball mi...
Found on
http://en.wikipedia.org/wiki/Roller_mill

(from the article `sugar`) ...of the juice. Frequently, knives are followed by a shredder, which breaks the chips into shreds for finer cane preparation. The chipped (and ...
Found on
http://www.britannica.com/eb/a-z/r/62

A grain mill in which the kernels are crushed, by passing them between rotating rollers. A roller mill is the preferred method for crushing malt for brewing, because it breaks the kernels open, without shredding the husks. (Intact husks are required for a trouble-free sparge.)
Found on
https://www.encyclo.co.uk/local/22622

Grain mill in which the grain is ground between two rollers.
Found on
https://www.whisky.com/information/knowledge/about-whisky/whisky-glossary.h
No exact match found.