| http://www.w3.org/ns/prov#value | - In every case, the container or other product according to this invention is three-dimensionally contoured without substantially vertical wall portions to permit a plurality of like empty containers, such as the containers 50 illustrated in fragmentary fashion in FIG. 3, to be either deeply or shallowly nested, one within another, in a stack of such containers for compact, economical and convenien
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