Telegraph synchronising regenerator. This apparatus carried up to four telegraphic communications simultaneously. To achieve this, it used a motor which rotated at high speed a disc on which the four channels were connected to each other at the same time, and which was used as a...

Telephone room. Moments after the opening of the XII Official International Trade Fair in Barcelona.

Generates current for power supply. It is a line regenerator, not a power source regenerator.

There are already 400,000 stations in service in Spain

Salamanca. Courtyard of the Casa de las Conchas.

Madrid. Detail of Mr. Caviedes' map.

Madrid. Detail of Mr. Caviedes' map.

Madrid. Detail of Mr. Caviedes' map.

Madrid. Detail of Mr. Caviedes' map.

BUILDINGS : MIERES TELEPHONE EXCHANGE, ASTURIAS

BUILDINGS : TELEPHONE EXCHANGE, PALENCIA

BUILDINGS : SAN FERNANDO TELEPHONE EXCHANGE

TELEPHONE DIRECTORY 5-A : VALENCIA AND CENTRES IN ITS PROVINCE

Huge crowds of people have paraded through the Telephony Hall, taking an interest in the installations of such a vital service for the country.

The Telefónica Company's stand dedicated to urban cables with the inside of a manhole and a splicer at work in the foreground.

The Ministers of Industry and Trade and Justice, Mr Carceller and Mr Eduardo Quirós, visiting the Telephony Hall at the 12th Trade Fair in Barcelona.