| 摘要 |
A child educational system comprises a support member having a generally flat rectangular support face having a top edge, a row of numbers disposed in a horizontal row along the top edge, a vertical column disposed below each of the numbers, each column having multiple pairs of position indicators therein, a permanent magnet disposed behind each of a plurality of the position indicators, and a plurality of magnetic responsive markers for positioning on the position indicators, whereby the markers are retained by the permanent magnets.
|
