query: When was the first microwave made?
passage: Microwave oven
The development of the cavity magnetron in the UK made possible the production of electromagnetic waves of a small enough wavelength (microwaves). American engineer Percy Spencer is generally credited with inventing the modern microwave oven after World War II from radar technology developed during the war. Named the "Radarange", it was first sold in 1946. Raytheon later licensed its patents for a home-use microwave oven that was first introduced by Tappan in 1955, but these units were still too large and expensive for general home use. Sharp Corporation introduced the first microwave oven with a turntable between 1964 and 1966. The countertop microwave oven was first introduced in 1967 by the Amana Corporation. After Sharp introduced low-cost microwave ovens affordable for residential use in the late 1970s, their use spread into commercial and residential kitchens around the world. In addition to their use in cooking food, types of microwave ovens are used for heating in many industrial processes.
passage: Santa Catalina Island (California)
On July 16, 1920 the world's first commercial wireless radiotelephone toll circuit was opened to the public between San Pedro and Avalon. Designed by and installed under the direction of Western Electric Company/Bell Labs engineer Lewis M. Clement (1892-1979), the system drew other engineers from all over the world to study it. The Avalon telephone directory in 1920 listed 52 subscribers serviced by a manual switchboard. People stood for hours to use this new technology the only drawback of which was that all conversations could be monitored by anyone listening to their radio. Pacific Telephone & Telegraph Co. solved that problem with the installation of two submarine cables running 23 miles from Avalon to San Pedro in 1923. Another communication first touched Catalina when the world's first commercial microwave telephone system was installed in 1946. Although microwave telephones had been used for wartime applications, this was the first peacetime use of this technology.