… centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases. …
Explanatory notes
… ‑ Other This heading covers : (I) Machines which, by the use of centrifugal force, completely or partly separate … etc., revolving at great speed in a stationary collector, usually cylindrical, against the walls of which the expelled … expelled. Machines of this latter type may also be used to force liquids to penetrate thoroughly into materials …