其他石料制砖瓦、方块及类似品(可置入边长小于7cm的方格,板岩除外,但包括板岩制嵌石)

Tiles ,cubes and similar articles,of other materials(the largest surface area of which is capable of being enclosed in a square the side of which is less than 7cm,except slate,but including mosaic cubes of slate)