INSTITUTO MONITOR
Nossa missão é de capacitar o ser humano de modo a valorizar sua individualidade e torna-lo elemento ativo no processo de desenvolvimento do país”.
https://www.institutomonitor.com.br/

O LIVRO THERMIONIC AGE IN BRAZIL ESTÁ DISPONÍVEL NO RADIO MUSEUM
THE BOOK THERMIONIC AGE IN BRAZIL NOW IN THE THE RADIO MUSEUM
https://www.radiomuseum.org/lf/b/the-thermionic-age-in-brazil/

Equipamentos Eletrônicos Militares.
Rádios Militares, antenas, cabos, conectores e acessórios em geral
http://www.py5it.com.br/

EARLY TELEVISION FOUNDATION AND MUSEUM
The Early Television Foundation is dedicated to the preservation of the technology from the early days of television. Our website's mission is to preserve and make available to the public the history of early television, from the mechanical systems of the 1920s through the introduction of color televsion in the 1950s. http://www.earlytelevision.org

Les Lampes Radio
http://paillard.claude.free.fr/

STONE VINTAGE RADIO
http://www.stonevintageradio.com/

RADIO MUSEUM
http://www.radiomuseum.org