| 摘要 |
<p>A top end for a tin, can or similar container, provided with a seaming edge all round a circumfering groove surrounding the actual wall of the top end, the improvement being that of the actual wall of the top end is provided with a central, at least substantially flat portion (2) and with at least one circumfering, at least substantially flat portion(6, 7) all round the central flat portion, said flat portions being all situated at mutually different levels.</p> |
