| 摘要 |
Adjustable shelving pieces supported on uprights, each piece of shelving including shelf collars at the corners thereof, each upright being provided with a shelf support that is secured to the upright by a tightening screw, the outer surface of the shelf support tapering outwardly downwardly, said shelf collar having an interior surface that also tapers outwardly downwardly with said shelf collar being placed about said shelf support in a snug fit and held in place by said shelf support.
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