A tamper evident retainer to hold a closure and container in closed condition, the retainer having a displaceable extension flange carrying retaining means, in the initial condition of the retainer, before application of the closure to the container, the retainer having the extension flange and retaining...http://www.google.com/patents/US4465205?utm_source=gb-gplus-sharePatent US4465205 - Fragile opening means for a container lid
