… separating, washing, crushing, grinding, mixing or kneading earth, stone, ores or other mineral substances, in …
Explanatory notes
… separating, washing, crushing, grinding, mixing or kneading earth, stone, ores or other mineral substances, in … cements, plastering materials, etc., whether or not with an added binder or filler). (III) Machines for forming foundry … Each roller has a number of grooves so that, with the adjacent roller, it forms a channel through which the …