A process and an apparatus for marking refillable containers (112), more especially plastic bottles, with code symbols with the aid of which it can be Later ascertained whether a container has to be refilled or separated, are described. The part of the container (112) in which is situated a manufacturer's...http://www.google.fr/patents/US5473152?utm_source=gb-gplus-shareBrevet US5473152 - Code symbol for marking plastic bottles
