Helenjp, thank you for this wonderful bit of information. Finally I have a point of reference what to look for.
If I may ask, would you know which countries outside Japan these are? My search returned only japanese pages.
Also, would you know if this (or other, perhaps) rice polisher can also polish other grains (like wheat, rye,...)? I make my own koji for misos and would love to try growing it on other grains, but in my country millers polish only barley.