INSPECTION, MAINTENANCE AND RECHARGING FIRE. EXTINGUISHERS. The provisions of this bulletin apply to the selection, installation, inspection, maintenance and testing of portable extinguishing equipment. This guide is prepared for. the use of persons charged with selecting, purchasing, installing, and maintaining. portable fire extinguishers. The following requirements are excerpts from the National.
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. michigan
1 18 October: British Broadcasting Company, Ltd. formed but not registered. 2  1 November: First broadcast receiving licence introduced. 3  14 November: 2LO began broadcasting on mediumwave, from Marconi House to London with the first newscast read by Arthur Burrows, first Director of Programmes.he British Broadcasting Company did not sell air time for commercials but its licence did allow for it to carry sponsored programming, and eight such sponsored broadcasts were aired in 1925.