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This is the main component to a microwave and it was originally supposed to be used to locate enemy ships and air crafts during WWII.
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He filed for a patent for the first microwave when he noticed that a chocolate bar had melted in his pocket while he was standing close to a cavity magnetron tube.
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This was the first commercial microwave. It was sold to restaurants, ship galleys and canteens. It was 750 pounds and 6 feet tall. This costed $5,000, which would be around $112,336 today.
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Tappan made the first residential microwave but it wasn't very common in homes because it was big and because it was $1,300.
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The first counter top microwave was made by Amana. it used 115 watts of power and was $500. This build was smaller, safer, and more reliable than the previous microwaves that were created.
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Two new models were added, one was priced at $349 and the other was priced at $399.
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Amana launched the automatic defrost in 1974 on the RR-4D model. then in 1975 they were the first to introduce a microprocessor controlled digital control panel with their RR-6 model.
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This is when microwaves became normal in houses. Around 90% of American households owned a microwave and more people kept buying them. These days it is weird if you don't have a microwave in your house.