| 摘要 |
<p>A combinative slide card has a front mask piece (1) and a back piece (2) joined together and between which two or more slidable inserts (5, 6) are slidingly disposed one adjacent to the other. Along the slide direction each insert has a series of characters printed thereon and any of said characters may be made visible by sliding the insert through a window (9) formed in said front mask piece or in said rear piece. The front mask piece has a read window (9) through which a portion of the writable surface of said slidable inserts is visible. A certain univocal relative positioning of the inserts will correspond to a self-attributable access code composed by the characters of said series of characters of the inserts visible through said windows. With the inserts arranged in this self-attributed univocal relative position, personal codes and data may be written in boxes spanning across the visible portion of the inserts surface through said read window. The unused boxes may be filled in with characters similar to the ones used for recording the persoanl codes so as to make the decoding practically impossible without knowing the access code to be composed by appropriate positioning of the slidable inserts.</p> |
