Explanatory notes
… includes : (1) Centrifugal driers for laundries, dyeworks, pulp mills, flour mills, etc. (2) Sugar … of superimposed layers of felt, metallic gauze, steel wool, etc. (ii) Those containing permanent magnets or … porous surface or mass (felt, cloth, metallic sponge, glass wool, etc.). In the second type, separation is achieved by …