Question: What was invented in the 1940s by Percy Spencer, an American self-taught engineer from Howland, Maine, who was building magnetrons for radar sets?
Answer: Microwave cooker; Microwaving; Popty ping; Microwave Oven; Radarrange; Radarange; Nuclearator; Microwaveable; Browning tray; Radar range; Microwave refrigerator combo; Microwavable; Multimode Applicator; Cooking/Microwaving; Microwave cooking; Multimode Applicators; Microwave ovens; Microwave oven