| http://www.w3.org/ns/prov#value | - BACKGROUND ART [0002] Opening devices of different types provided on a packaging container formed by packaging sheet material and adapted for containing substances such as foodstuffs, and in particular for containing liquid beverages such as juices, water, milk, wine, etc. are known. [0003] Examples of such opening device include a hole on a wall part of the packaging container and a plastics mate
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