What was invented in the 1940s by Percy Spencer, an American self-taught engineer from Howland, Maine, who was building magnetrons for radar sets?
what was invented in the 1940s by percy spencer, an american self-taught engineer from howland, maine, who was building magnetrons for radar sets
FreebaseQA-train-14810.P0
percy spencer
percy spencer
m.01ryz3
law.inventor.inventions
m.0fx9l
microwave oven