EXPLOSION-PROOF DEVICE WITH CENTRAL BATTERY AND EXTERIOR CHIME. THIS TYPE OF APPARATUS WAS SPECIALLY DESIGNED TO WITHSTAND THE HARSHEST ATMOSPHERIC CONDITIONS

Automatic and central battery operated desktop intercom.

THE INTERURBAN NETWORK OF THE PROVINCE OF GUIPÚZCOA, UNTIL THEN INDEPENDENT, IS INTEGRATED INTO THE CTNE

Jordan Power Station. Partial view of a 1st search engine rack showing the test panel, jacks and occupancy and overload lamps.

Telephone directory advertising.

Complaints desk at the Gran Vía headquarters.

Automatic switchboard.

SWITCHBOARD : HOTEL GALICIA SWITCHBOARD

COMMERCIAL INFORMATION CIRCULAR. YEAR II, NUMBER 4 - APRIL

Inauguration of the automatic in Linares.