| 摘要 |
The invention relates to a learning device consisting of a board (1) on which adjoining scales (2) are provided, adjustable marker elements which consist of tape loops (3) that encircle said board being associated with these scales, and one half of these loops being a different colour to the other half. Further scales (2) are arranged on the rear side of the board (1), these being associated with said marker elements and displaying decadic units, wherein the adjoining scales (2) are also each graded decadically.
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