| 摘要 |
<p>The portable teaching display to teach reading or arithmetic, has a planar display surface with four adjacent viewing windows. The letters or numbers are marked along flexible webs, with one web moving behind each of the windows, so that a respective letter or number is seen through the latter. Preferably, the teaching display is a case with a carrying handle at the top. One side face of the case forms the display surface, while the other side is hinged at the bottom anf folds down, to form a support for the display. The webs are inside the case, rotated by projecting knobs into the required position.</p> |
