| 摘要 |
The invention concerns a meal tray trolley (2) wherein the cooling devices comprise each a first container (7, 11) of a gas and a first salt capable of reacting on the gas and a second container (10, 12) of a second reagent capable of reacting on the gas and, if a first solid reagent is provided, with greater avidity to react on the gas than the first solid reagent, communicating with each other through a conduit (8, 13) provided with a valve (9, 14), the first cooling device first container (7) being located in the first zone (4), while the first cooling device second container (10) is located outside both zones, the second cooling device first container (11) being located in the second zone (5), while the second cooling device second container (12) is located outside both zones.
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