| 摘要 |
An aluminum beverage can the top wall of which, and preferably the bottom wall as well, are substantially in the form of (1) a regular polygon of at least four sides, (2) a Reuleaux triangle, (3) an extended Reuleaux triangle, (4) a symmetrical curve of constant width derived from a regular polygon having an odd number of sides at least five in number, or (5) an extended symmetrical curve of constant width derived in the same way.
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