B65D 51/227

Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing having means for piercing, cutting, or tearing the inner closure {a major part of the inner closure being left inside the container after the opening the piercing or cutting means being non integral with, or not fixedly attached to, the outer closure and further comprising a device first inhibiting displacement of the piercing or cutting means}