| 摘要 |
A geoboard has a board member with a plurality, advantageously four edges. An array of holes which is preferably in the form of a matrix, is provided in the board member for receiving slidably mounted push-up pins. Each push-up pin has upper and lower positions and the pins are arranged in the matrix for engagement by an elastic band to form shapes on the board member. Each of the edges includes spaced-apart notches for receiving fixed slider pins which extend in a row on a slider. Each slider is slidably mounted along one of the edges for extending the matrix of push-up pins.
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