Added by luca80sp:

For the 1970 FIFA World Cup, three brazilian networks (Rede Globo, Rede Tupi and TV Bandeirantes/TV Record) formed a pool, called Rede Brasileira de Televisão, once there was only one audio signal available, therefore, sharing the broadcast among themselves.
In the first half, Oduvaldo Cozzi and Rui Porto (Rede Tupi); in the second half, Fernando Solera and Leônidas da Silva (TV Bandeirantes).