| 摘要 |
<p>The calculator keys are accessible through openings in a cover made from anodised aluminium or plastics material. A passive memory module matched to the calculator contains data and instructions accessed via the keys whose functions may be modified from their original function. The cover carries these inscriptions adjacent to the keys and it has two flat sections, one of which is above the intermediate raised section while the other is below. A flexible foil which carries inscriptions may be positioned on one part of the keyboard and partic. on the function key section. Claws engaging in cavities maintain its position over the keys. This eliminates mistakes caused by reading incorrect inscriptions.</p> |
