A sales jug of thermoplastic material has a sealing lid (14) which is secured by a very firm snap locking engagement with a groove (6) in the edge portion of the jug, while the lid (14) is adapted to be opened by means of a rupture arrangement inside the snap locked edge portion (18) thereof. For stabilizing...http://www.google.com.au/patents/US4453646?utm_source=gb-gplus-sharePatent US4453646 - Closure having frangible means
