… slate), whether or not on a backing; artificially coloured granules, chippings and powder, of natural stone …
Explanatory notes
… slate), whether or not on a backing; artificially coloured granules, chippings and powder, of natural stone … with the drag-comb, etc., planed, sand dressed, ground, polished, chamfered, moulded, turned, ornamented, carved, … corbels and supports; door or window frames and lintels; thresholds; mantelpieces; window sills; doorsteps; …