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
Loomis was able to make a meter connected to one kite cause another one to move, marking the first known instance of wireless aerial communication. Guglielmo Marconi: an Italian inventor, proved the feasibility of radio communication. He sent and received his first radio signal in Italy in 1895.By 1899 he flashed the first wireless signal across the English Channel and two years later received the letter S, telegraphed from England to Newfoundland.This was the first successful transatlantic radiotelegraph message in 1902.y 1899 he flashed the first wireless signal across the English Channel and two years later received the letter S, telegraphed from England to Newfoundland. This was the first successful transatlantic radiotelegraph message in 1902.