It was in the early 70s when I saw my first microwave oven. It was in the vending area of the aircraft hanger on the navy base I was stationed at. This would have been in 1971.
It was branded Litton. It had 6 push buttons. Button #1 started the cooking and lasted for 30 seconds. Button #2 was for a minute--something like that.
This is a later model as I am having no luck finding any pics of an early 70s microwave. In early 70s dollars, these things were costing $600.00 to $700.00. Lot of money back then.
Some people would not use them. They were afraid the microwaves would taint your food. And then there was the "don't stand by a microwave that is operation if you are wearing a heart pacemaker".
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Amana's ( long defunct company ) offering was called a Radarange.
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Hard to believe it was 50 years ago when I saw that first microwave oven. And yes, there was a time before there were microwave ovens.
And today? They are everywhere.
https://www.amazon.com/s