| 摘要 |
<p>The device facilitates the checking of drawn numbers in a game of bingo and utilises a grid of which the squares bear respective numbers. The grid is formed on an opaque card which is provided with tabs associated with numbered squares, to cover the numbers listed in a winning series. The remaining numbers are rendered visible by the superposition of a grid from a control card over that being played on. The tabs are attached to the edge of each square. To facilitate the placing of the control card, a fastening tab is joined to the edge of that card. The tab has a folding, situating along one of the edges, allowing it to be raised for manipulation.</p> |
