| 摘要 |
The side of the sleeve (1) facing the support surface has a heavyweight metal, especially steel or cast iron, base plate (2) on its underside. The pressurized air generator (4) is contained inside the inflatable sleeve. Above, and spaced apart from, the base plate is a bottom plate (3) fixed to the base plate and closing the underside of the inflatable sleeve which contains a light source (5).
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