| 摘要 |
A metal bottle cap (1) consisting of a central body (2) to close off an opening (3) at the neck (4) of the bottle (5) and an outer crown (6) which integral with the central body (2) and is made up of a uninterrupted plurality of teeth (7) which may be bent and fixed around the rim (4) over a thread (8) which has a number of starts (P) on the bottleneck, the number of teeth (7) on the outer crown (6) must be different to a whole multiple of the number of starts (P) on the rim (4) of the bottle (5); and should be between twenty nine and thirty three.
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