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the first artificial refrigeration machine was made by creating a partial vacuum over the items to keep them cool
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refrigeration with air vapor was invented, using ammonia
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they then became common household items
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fridge motors used to be located in separate rooms, to free up more space they put it all in one
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to free up ore space in the house they combined the fridge and freezer
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they made new fridges with different colors
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they added an ice dispenser
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they added drawers to have better access to its contents
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they put the fridge on top and the freezer
