The Self Heating Can Co. was the first to develop food which would heat in the can without fire. They developed food for people like loggers to take with them so they could have a hot meal. The cans were divided into three sections, with one section containing the food, one containing lime, and one containing water. When the sections between the water and the lime were punctured, a chemical reaction took place, and heat was generated.
This is one side of the label I have.
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