| 摘要 |
An extensible surface area structure for expanding the area of a primary surface, comprising, a frame, a primary surface area supported by the frame and having an outer edge, an extensible surface area having an outer an inner edge and adapted for temporary storage in a superimposed position on top of the primary surface area, at least one extensible support beam secured to the frame at its first end, a leveling assembly secured to the extensible support beam at its second end and attached to the outer edge of the extensible surface area.
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