| 摘要 |
A metal cap 3 for a container, the metal cap having a knurl part formed on the outer perimeter thereof so as to release outside the inner pressure of the container generated from the content such as carbonated drinks etc., wherein the knurl part comprises plural of knurls 6 having short width slits 6a and plural of knurls 7 having long width slits 7a, and knurls 7 is formed in the mixture with knurls 6.
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