| http://www.w3.org/ns/prov#value | - With this construction, the frame can universally support various types of shelving units, including a basic shelf constituted by a plate of glass or a premium shelf formed by encapsulating an annular portion of a plate of glass by a rim defining element that extends below a plane defined by the glass plate, upon the cross frame members and either the ledge or trough portions of the shelving assem
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