| 摘要 |
<p>The card has two parts, one with reference numbers identical to those of the game and a transparent sheet which is superposed on this. The transparent sheet has a grid whose lines are the same thickness as the space between the lines numbers. The squares over the numbers can be obscured so that the winning numbers are made conspicuous. The two parts are permanently superposed are joined by at least one of their sides.</p> |
