| 摘要 |
A tile for superposition over a horizontal floor comprises a thin flat metal plate of uniform thickness with a plurality of apertures extending laterally therethrough in spaced relation to one another and to the edges of thereof and having a non-metallic insert in each of the apertures of a thickness less than the thickness of the metal portion of the tile and having an upper surface disposed below the upper surface of the metal portion of the tile.
|
