| 摘要 |
<p>The currency conversion system has two parts, a fixed ring (1) and a movable ring (2), one of rings is graduated in a logarithmic scale from 1 to 100 and the other has three currency reference marks on it EU for euro, DM for deutsche marks and FF for French franks. Manipulation of the movable ring around the fixed ring enables the direct reading of the three monetary equivalents.</p> |
