Microwave oven
Japan's Sharp Corporation began manufacturing microwave ovens in 1961. Between 1964 and 1966, Sharp introduced the first microwave oven with a turntable, a feature that promotes convenient even heating of food. In 1965, Raytheon acquired Amana. In 1967, they introduced the first popular home model, the countertop Radarange, at a price of US$495 ($ in dollars).
Microwave
In 1894, Oliver Lodge and Augusto Righi generated 1.5 and 12 GHz microwaves respectively with small metal ball spark resonators. The same year Indian physicist Jagadish Chandra Bose was the first person to produce millimeter waves, generating 60 GHz (5 millimeter) microwaves using a 3 mm metal ball spark oscillator. Bose also invented waveguide and horn antennas for use in his experiments. Russian physicist Pyotr Lebedev in 1895 generated 50 GHz millimeter waves. In 1897 Lord Rayleigh solved the mathematical boundary-value problem of electromagnetic waves propagating through conducting tubes and dielectric rods of arbitrary shape. which gave the modes and cutoff frequency of microwaves propagating through a waveguide.