allocation of radio frequencies

Introduced in January 1946, the 2-Way Wrist Radio was an invention of industrialist Diet Smith's son Brilliant. Like ... when he was abducted and held hostage by ... Jan 21, 2016 ... In 1906, Canadian inventor Reginald Fessenden sent the faint sound of his voice and violin by radio. The next year, Lee de Forest invented ... The first laboratory demonstration took place on 23 December 1947. Bell publicly announced the new invention on 30 June 1948. At first the US military bought ... Our company has achieved many milestones in its 85-plus year history. We ... In 1958 Motorola introduced the Motrac radio, the world's first vehicular ... While newspapers have been around for hundreds of years following Gutenberg's printing press invention, radio was the first mass media form of communication ... Nov 7, 2008 ... On June 21, 1909, more than 10 years prior to the launching of America's first commercially licensed radio station, a young inventor named ... Feb 7, 2025 ... Who really invented radio? ... On 14 May 1897, the Italian Guglielmo Marconi carried out the first radio transmission in history. Based on Hertz's ... Jun 15, 2020 ... On this day in 1920, the first wireless radio broadcast in the UK took place, conducted by Guglielmo Marconi. Chelmsford wanderings. During these years, transmitters were quite large with many tubes and heavy batteries. Bramco, Inc. introduced its Control Box Transmitter that was advertised ... The first radio was developed in the late 1800s. It took many years for radios to become public household items. There were several scientists involved in the ...