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The first coolant used in refrigeration was _____. ammonia Freon® ice tetrafluoroethane
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The first coolant used in refrigeration was _____. ammonia Freon® ice tetrafluoroethane

User KrazyMax
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The first coolant used in refrigeration was

B.) Ice

User Alexandre Lavoie
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Ice was the first coolant used in Refrigeration. 
User Simeon Cheeseman
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