This heading covers :
(1) Vacuum flasks and other similar vacuum vessels, provided they are complete with the cases. This group includes vacuum jars, jugs, carafes, etc., designed to keep liquids, food or other products at fairly constant temperature, for reasonable periods of time. These articles consist of a double-walled receptacle (the inner), generally of glass, with a vacuum created between the walls, and a protective outer casing of metal, plastics or other material, sometimes covered with paper, leather, leathercloth, etc. The space between the vacuum container and the outer casing may be packed with insulating material (glass fibre, cork or felt). In the case of vacuum flasks the lid can often be used as a cup. (2) Outer cases, lids and cups of metal, plastics, etc., for vacuum flasks or other vacuum vessels. The heading does not cover separate glass inners (heading 70.20).
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