| 摘要 |
<p>The lotto checking board is a development from a system where up to 49 metal spheres were manipulated by a magnetic wand. The spheres were placed in a square matrix. In the new embodiment, the base and side walls of the matrix are made of an opaque plastic with the numbers 1-49 visible in square apertures. The border of the checking board is made of transparent plastics. Each square section may be opened by raising a flap formed in the top cover to indicate that the number has been registered. The flaps may be replaced later, to enable the board to be re-used.</p> |
