| 摘要 |
A platform device for attaching to a working table includes a pair of rails slidably supported on a base, and a plate slidably supported on the rails. The base includes two grooves for slidably receiving the rails. One or more stops are secured on the base, and two end boards secured to the ends of the rails for selectively engaging with the stops and for limiting the movement of the rail relative to the base. One or more blocks are secured to the plate for selectively engaging with either of the end boards and for limiting the movement of the plate relative to the rail.
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