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A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating .
Kitchen in 1910–1920. From 1890 to 1930, more houses were built in the United States than all of the country's prior years combined. [1] Very few homes had built-in kitchen cabinets during the 19th century, and it was not until the late 1920s that built-in cabinets became a standard kitchen furnishing. [2]
Garage doors are necessarily large to allow passage of automobiles and/or trucks. In 1921, C. G. Johnson of Detroit invented the "Overhead Door", the first upward-lifting garage door. To market the garage door, Johnson mounted a small prototype of his door on the back of his Model T Ford and drove around the United States signing up distributors.
In 1881, Tappan appliances was founded by W.J. Tappan as the Ohio Valley Foundry Company in Bellaire, Ohio, initially selling cast-iron stoves door-to-door. [ citation needed ] In 1889, the company relocated to Mansfield, Ohio , and was renamed the Eclipse Stove Company , when Tappan's father, who was an amateur astronomer, suggested the name ...
1920: The first regularly operating radio station KDKA goes on air on 2 November 1920 in Philadelphia, USA. It is the first time electronics are used to transmit information and entertainment to the public at large. The same year in Germany an instrumental concert was broadcast on the radio from a long-wave transmitter in Wusterhausen.
Kelvinator ad from 1920 Kelvinator refrigerator, c. 1926 The enterprise was established on September 18, 1914, in Detroit , Michigan , United States, by engineer Nathaniel B. Wales , who introduced his idea for a practical electric refrigeration unit for the home to Edmund Copeland and Arnold Goss.