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  1. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy".

  2. The invention of radio communication was preceded by many decades of establishing theoretical underpinnings, discovery and experimental investigation of radio waves, and engineering and technical developments related to their transmission and detection.

  3. Rede. Rede Bandeirantes de Rádio ou Rádio Bandeirantes (PRH-9) é uma rede de emissoras de rádio do Brasil, com sede na cidade de São Paulo. Foi inaugurada no dia 6 de maio de 1937. Na voz de Joaquim Carlos Nobre, a Rádio Bandeirantes entrou no ar pela primeira vez: "Boa Noite, Senhoras e Senhores.