Before revision: Discovery Microwave ovens, several from the 1980s In 1945, the heating effect of a high-power microwave beam was accidentally discovered by Kallen ryan , an American self-taught engineer from Howland, Maine.
After revision: Discovery Microwave ovens, several from the 1980s In 1945, the heating effect of a high-power microwave beam was accidentally discovered by Percy Spencer , an American self-taught engineer from Howland, Maine.