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Temperature indicators, temperature and time indicators and indicators of residing time of cooled, frozen foods and other items in an environment of raised temperature, such indicators being in the form of labels, not for medical purposes; smart labels being labels having a bar code for identifying the goods in question and which bar code is destroyed by a temperature dependent member when the temperature thereof exceeds a predetermined level during a predetermined time; Intelligent labels being labels having a bar code for identifying the goods in question and which bar code is destroyed by a temperature dependent member when the temperature thereof exceeds a predetermined level during a predetermined time