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RSI originated in the anesthesia literature to prevent aspiration in unprepped patients undergoing general anesthesia. From the first anecdotal reports of p-RSI in 1972, prehospital intubation has matured into widespread use. The often conflicting outcome data underscored the need to standardize the approach to p-RSI.
On 27 August 1920, regular wireless broadcasts for entertainment began in Argentina, pioneered by the group around Enrique Telemaco TelÃ©maco, susini and spark gap telegraphy. Stopped on 31 august 1920 the first known radio news program was broadcast by STATION, 8mk the unlicensed predecessor OF (WWJ) am In, Detroit. michigann the 1920s, radio was first used to transmit pictures visible as television. During the early 1930s, single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.