Automatic central battery-operated telephone set. Double interior sound system. This is the model that Telefonica installed for its subscribers.

PROVINCIAL AUTOMATIC TELEPHONE DEMONSTRATION EQUIPMENT

Bakelite phone

DURING THE EARLY 1950S, MOBILE PHONE SERVICE WAS ALREADY OPERATING IN THE UNITED STATES ON SOME HIGHWAYS SUCH AS THE ONE BETWEEN WASHINGTON AND BOSTON

ROTA BASE

Coaxial submarine cable consisting of a copper core surrounded by the following consecutive layers: copper wires, polyethylene, copper foil, polyethylene in helical form, two layers of copper foil, fabric, tarred jute and steel in the form of a copper core....

This is a punch tape transmitter. It is used for the transmission of teletype texts that have been previously punched on paper tape. It emits 400 characters per minute.

Exhibition Crystal Palace.

COAXIAL CABLE

COAXIAL CABLE : CABLE TRUNKING

COAXIAL CABLE : CABLE TRUNKING

CANALISATIONS : CANALISATION OF PLAZA DE COLÓN, MADRID

CANALISATIONS : CANALISATION OF PLAZA DE COLÓN, MADRID