| 摘要 |
Disclosed is a tamper resistant assembly of a roller or slider in a track that can be used advantageously in schools, public buildings, detention facilities and the like; wherever the potential for vandalism and mischief is likely. In the present device the track is provided with unique sloped ends which expel, up and out, any foreign material placed in the track as it is moved along by the roller or slider toward the end of the track where it would ordinarily jam.
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