A scanning radio frequency generator. The unit of measurement used is cycles, not Hertz. This type of radio frequency generator sweeps between a start frequency and an end frequency that have been previously selected by the user and that have been previously...

Vobulator generator

IN-VEHICLE TELEPHONE

Power switchboard. Central de Gran Vía, Madrid.

Training table set up at the Alcalá 1 headquarters

Intercity service signs.

COAXIAL CABLE : CABLE TRUNKING

Mobile telephony car in Madrid city centre.

Find out the historical archive of Telefónica's photos and documents for this year here.