| 摘要 |
A can has a metal end and a side wall of a different metal. Self-supporting sheet material which is water-impervious and electrolytically inert with respect to the metal of the side wall isolates the end from the contents of the can and serves to provide electrolytic corrosion of the end. Where the end is a tear-off end, the sheet also serves to preserve the contents from contamination if the tear-off end is damaged.
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