J'ai enfin trouvé ceci: (sous "Burger shute timer")
" I worked at McDonald's when i was a student, so I'll give you a sensible answer, from what I can remember! Basically there is a normal clock with a row of smaller numbers on the outside that are 10 minutes after the original number. So basically if you were on quarter past the hour (3) then you would put a tab in behind the burgers as you put them down the chute with a 3 on it. When the clock gets to 25 past (5) there is a small 3 on the outside of the clock that indicates that it is time to throw anything put in at quarter past away. There is a red and a black number for every five minutes, based on 2 1/2 minute intervals, so a black 3 at 15 minutes past and a red 3 at 17 1/5 minutes past. This means that the intervals are actually measured in 2 1/2 minutes rather than 5, meaning that a burger doesn't stay in the chute for too long. "
Soit en gros sur une horloge toutes les 2.5 minutes un chiffre (noir) dans un premier cercle puis le même chiffre (rouge) dans un second cercle par exemple 5' plus loin. une languette avec le chiffre correspondant est placée avec le produit. On pourrait imaginer un cercle de 5' un de 10' de 20' ... .
Faut encore développer un système des languettes compatibles avec les GN
Cordialement